Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-48. Weeks 49-52 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it until week 49.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 52 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 223.7 cases per 100,000 under the age of 12 months. The second highest rate is 131.3 in ages 1 to 4. The third highest rate is 90.3 in ages 14 to 18. So far in 2025, 182 infants have been diagnosed with pertussis, an increase of 2 since last reported. Of those infected, 19 were too young to have received the first dose of vaccine, 46 received at least one dose of vaccine, and 117 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 52 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 65.2 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 46 to 52. There are o counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,11 cases in weeks 1 to 52 of 2025, up 13 from the previous report published. In 2024 there were 2,294 cases by this week. Tests have ~4wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-47. Weeks 48-51 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it until week 49.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 51 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 221.2 cases per 100,000 under the age of 12 months. The second highest rate is 130.4 in ages 1 to 4. The third highest rate is 89.7 in ages 14 to 18. So far in 2025, 180 infants have been diagnosed with pertussis, an increase of 0 since last reported. Of those infected, 19 were too young to have received the first dose of vaccine, 45 received at least one dose of vaccine, and 116 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 51 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 64.7 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 45 to 51. There are no counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,098 cases in weeks 1 to 51 of 2025, up 8 from the previous report published. In 2024 there were 2,211 cases by this week. Tests have ~4wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-46. Weeks 47-50 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it until week 49.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 50 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 221.2 cases per 100,000 under the age of 12 months. The second highest rate is 130.1 in ages 1 to 4. The third highest rate is 89.5 in ages 14 to 18. So far in 2025, 180 infants have been diagnosed with pertussis, an increase of 3 since last reported. Of those infected, 19 were too young to have received the first dose of vaccine, 45 received at least one dose of vaccine, and 116 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 50 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 64.5 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 44 to 50. Sevens county is the only one coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,090 cases in weeks 1 to 50 of 2025, up 19 from the previous report published. In 2024 there were 2,114 cases by week 50. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-45. Weeks 46-49 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it until this week.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 49 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 217.5 cases per 100,000 under the age of 12 months. The second highest rate is 129.5 in ages 1 to 4. The third highest rate is 89.1 in ages 14 to 18. So far in 2025, 177 infants have been diagnosed with pertussis, an increase of 0 since last reported. Of those infected, 19 were too young to have received the first dose of vaccine, 43 received at least one dose of vaccine, and 115 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 49 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 64.0 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 43 to 49. There are 2 counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. They are in alphabetical order: Stevens and Whitman. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,071 cases in weeks 1 to 49 of 2025, up 22 from the previous report published. In 2024 there were 2,037 cases by week 49. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-43. Weeks 45-48 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since, but as of this week's report it is nearly touching to the epidemic threshold.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 48 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 217.5 cases per 100,000 under the age of 12 months. The second highest rate is 127.5 in ages 1 to 4. The third highest rate is 88.3 in ages 14 to 18. So far in 2025, 177 infants have been diagnosed with pertussis, an increase of 3 since last reported. Of those infected, 19 were too young to have received the first dose of vaccine, 43 received at least one dose of vaccine, and 115 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 48 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 63.6 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 42 to 48. There are 2 counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. They are in alphabetical order: Stevens and Whitman. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,049 cases in weeks 1 to 48 of 2025, up 11 from the previous report published. In 2024 there were 1,927 cases by week 48. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-43. Weeks 44-47 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since, but as of this week's report it is nearly touching to the epidemic threshold.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 47 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 213.9 cases per 100,000 under the age of 12 months. The second highest rate is 126.9 in ages 1 to 4. The third highest rate is 88.1 in ages 14 to 18. So far in 2025, 174 infants have been diagnosed with pertussis, an increase of 4 since last reported. Of those infected, 17 were too young to have received the first dose of vaccine, 43 received at least one dose of vaccine, and 114 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 47 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 63.1 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 41 to 47. There are 2 counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. They are in alphabetical order: Stevens and Whitman. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,038 cases in weeks 1 to 47 of 2025, up 18 from the previous report published. In 2024 there were 1,813 cases by week 47. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-42. Weeks 43-46 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since, but as of this week's report it is nearly touching to the epidemic threshold!

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 46 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 208.9 cases per 100,000 under the age of 12 months. The second highest rate is 125.8 in ages 1 to 4. The third highest rate is 87.0 in ages 14 to 18. So far in 2025, 170 infants have been diagnosed with pertussis, an increase of 1 since last reported. Of those infected, 16 were too young to have received the first dose of vaccine, 42 received at least one dose of vaccine, and 112 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 46 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 62.7 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 40 to 46. There are no counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 2,020 cases in weeks 1 to 46 of 2025, up 26 from the previous report published. In 2024 there were 1,687 cases by week 46. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-41. Weeks 42-45 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since, but as of this week's report it is nearly touching to the epidemic threshold!

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 45 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 207.7 cases per 100,000 under the age of 12 months. The second highest rate is 123.1 in ages 1 to 4. The third highest rate is 86.0 in ages 14 to 18. So far in 2025, 169 infants have been diagnosed with pertussis, an increase of 0 since last reported. Of those infected, 16 were too young to have received the first dose of vaccine, 42 received at least one dose of vaccine, and 111 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 45 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 62.2 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 38 to 44. There are no counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,994 cases in weeks 1 to 45 of 2025, up 14 from the previous report published. In 2024 there were 1,540 cases by week 45. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-40. Weeks 41-44 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since, but as of this week's report it is almost down to the epidemic threshold!

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 44 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 207.7 cases per 100,000 under the age of 12 months. The second highest rate is 122.9 in ages 1 to 4. The third highest rate is 85.4 in ages 14 to 18. So far in 2025, 161 infants have been diagnosed with pertussis, an increase of 1 since last reported. Of those infected, 16 were too young to have received the first dose of vaccine, 42 received at least one dose of vaccine, and 111 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 44 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 62.2 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 38 to 44. There are no counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,980 cases in weeks 1 to 44 of 2025, up 9 from the previous report published. In 2024 there were 1,419 cases by week 44. Tests have ~4 week lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-39. Weeks 40-43 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 43 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 200.5 cases per 100,000 under the age of 12 months. The second highest rate is 122.3 in ages 1 to 4. The third highest rate is 85.2 in ages 14 to 18. So far in 2025, 168 infants have been diagnosed with pertussis, an increase of 4 infants since last reported. Of those infected, 16 were too young to have received the first dose of vaccine, 42 received at least one dose of vaccine, and 110 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 43 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 79.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 62.0 and the third highest rate is 53.4 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 37 to 43. Adams is the only county coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,971 cases in weeks 1 to 43 of 2025, up 19 from the previous report published (wk 42). In 2024 there were 1,294 cases by week 43. Tests have ~4 wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-38. Weeks 39-42 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 42 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 199.4 cases per 100,000 under the age of 12 months. The second highest rate is 119.7 in ages 1 to 4. The third highest rate is 86.2 in ages 14 to 18. So far in 2025, 164 infants have been diagnosed with pertussis, an increase of 3 infants since last reported. Of those infected, 16 were too young to have received the first dose of vaccine, 42 received at least one dose of vaccine, and 106 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 42 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 80.2 patients per 100,000 residents. The county with the second highest rate is Spokane with 62.2 and the third highest rate is 53.9 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 36 to 42. Adams is the only county coded as having 10 or more cases per 100,000 residents in the past 6 weeks. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,952 cases in weeks 1 to 42 of 2025, up 11 from the previous report published (wk 41). In 2024 there were 1,205 cases by week 42. Tests have ~4 wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

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#Measles #MeaslesTracker #MeaslesExposure #WashingtonState #ExposureMap #WADOH

Measles Exposure Map for Washington State.

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Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-37. Weeks 38-41 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 41 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 195.7 cases per 100,000 under the age of 12 months. The second highest rate is 119.2 in ages 1 to 4. The third highest rate is 86.2 in ages 14 to 18. So far in 2025, 161 infants have been diagnosed with pertussis, an increase of 1 infant since last reported. Of those infected, 15 were too young to have received the first dose of vaccine, 39 received at least one dose of vaccine, and 107 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 41 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 70.7 patients per 100,000 residents. The county with the second highest rate is Spokane with 62.0 and the third highest rate is 53.9 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 35 to 41. There are no counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,941 cases in weeks 1 to 41 of 2025, up 9 from the previous report published (wk 40). In 2024 there were 1,108 cases by week 41. Tests have ~4 wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-35. Weeks 36-39 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 38 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 192.1 cases per 100,000 under the age of 12 months. The second highest rate is 116.0 in ages 1 to 4. The third highest rate is 85.2 in ages 14 to 18. So far in 2025, 158 infants have been diagnosed with pertussis, an increase of 2 infants since last reported. Of those infected, 15 were too young to have received the first dose of vaccine, 38 received at least one dose of vaccine, and 105 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 38 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 70.7 patients per 100,000 residents. The county with the second highest rate is Spokane with 60.9 and the third highest rate is 53.9 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 33 to 39. There are two counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. They are in alphabetical order: Pend Oreille and Skamania. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,913 cases in weeks 1 to 39 of 2025, up 17 from the previous report published (wk 38). In 2024 there were 969 cases by week 39. Tests have ~4 wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, and 31-34. Weeks 35-38 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 38 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 189.7 cases per 100,000 under the age of 12 months. The second highest rate is 115.1 in ages 1 to 4. The third highest rate is 84.6 in ages 14 to 18. So far in 2025, 156 infants have been diagnosed with pertussis, an increase of 6 infants since last reported. Of those infected, 15 were too young to have received the first dose of vaccine, 37 received at least one dose of vaccine, and 104 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 38 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 70.7 patients per 100,000 residents. The county with the second highest rate is Spokane with 60.4 and the third highest rate is 53.9 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 32 to 38. There are two counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks. In alphabetical order: Pend Oreille and Skamania. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,896 cases in weeks 1 to 38 of 2025, up 25 from the previous report published (wk 37). In 2024 there were 924 cases by week 38. Tests have ~4 wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2024 and 2025 by week of symptom onset. The 4 most recent weeks of data are marked as incomplete. This year has exceeded the number of cases reported from last year in all cases except for weeks 21, 31, 32, and 33. Weeks 34-37 are considered incomplete. Figure 2 shows a line graph charting the number of cases diagnosed going back 10 years. There are two horizontal dashed lines going across the entire length of time. The bottom dashed line is the threshold for the projected baseline number of cases, and the dashed line above it is the projected epidemic threshold. The current wave of cases exceeded the epidemic threshold back in Feb. 2024 and has remained above it ever since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 37 in 2025, and compares that to the rate of patients by each age group's population. The highest rate is 182.4 cases per 100,000 under the age of 12 months. The second highest rate is 113.4 in ages 1 to 4. The third highest rate is 84.2 in ages 14 to 18. So far in 2025, 150 infants have been diagnosed with pertussis, an increase of 11 infants since last reported. Of those infected, 14 were too young to have received the first dose of vaccine, 36 received at least one dose of vaccine, and 100 were old enough for at least one dose but had not received any.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 37 in 2025, and compares that to the rate of patients by each county's population. There are 34 out of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Adams with 66.0 patients per 100,000 residents. The county with the second highest rate is Spokane with 58.8 and the third highest rate is 53.9 in Jefferson county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 31 to 37. The counties coded as having 10 or more cases per 100,000 residents in the past 6 weeks are, in alphabetical order: Pend Oreille and Skamania. Note: To request this document in another format, call 1-800-525-0127. Deaf or heard of hearing customers, please call 711 (Washington Relay) or email doh.information@doh.wa.gov

#WADOH #Pertussis / #WhoopingCough report for #WashingtonState

There are a total of 1,871 cases in weeks 1 to 37 of 2025, up 80 from the previous report published (week 35). In 2024 there were 868 cases by week 37. Tests have ~4 wk lag before being counted.

Full report: doh.wa.gov/you-and-your...

Washington State Department of Health

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Summary of report with Figure 1, a vertical bar graph, shows a comparison of the number of cases in 2023 and 2024 by week diagnosed. For weeks 1 to 46 in 2024 there are a total of 1,436, up 133 cases from the previous week's total. For weeks 1 to 46 in 2023 there was a total of 57 cases. Figure 2 shows a line graph charting the of number of cases diagnosed each month since 2014. There are two horizontal lines going across the entire length of time, one is a projected baseline for the number of cases considered normal, and another line above that showing the number of cases required to meet and/or exceed a projected epidemic threshold. The most recent wave of cases exceeded the epidemic threshold back in Jan. 2024 and has remained above it since.

Table 1 outlines specific details of age groups and case numbers over weeks 1 to 46 in 2024, and compares that to the rate of patients by each age group's population. The highest rate of cases per 100,000 people is 158.3 in those under the age of one. The second highest rate is 87.3 in ages one to four. The third highest rate is 67.4 in ages 14 to 18. So far in 2024 140 infants have been infected with pertussis, up 26 infants since last week. Of the 140 infants infected there were 21 infants too young to have received the first dose of vaccine. Of the remaining 119 infants old enough only 24 had received at least one dose of vaccine.

Table 2 outlines specific details of counties and case numbers over weeks 1 to 46 in 2024, and compares that to the rate of patients by each county's population. There are 32 out a total of 39 counties in Washington state that have reported at least one case this year. The county with the highest rate of cases is Whitman county with 133.9 patients per 100,000 residents. The county with the second highest rate 110.1 in Pend Oreille. The third highest rate is 91.0 in Clark county.

Figure 3 is a map of Washington state with each county color-coded to show the pertussis incidence rates from weeks 40 to 46.

#WADOH 's weekly report for #Pertussis ( #WhoopingCough )
doh.wa.gov/you-and-your...

Summary of report with Figure 1 showing a comparison of 2023 and 2024 cases by week. A total of 1,303 cases for 2024 (weeks 1 - 45), up 110 from week 44. In 2023 the total for weeks 1 - 45 was only 54 cases. Figure 2: Graph showing the number of pertussis cases over time with the baseline and epidemic thresholds outlined. Epidemic threshold was surpassed in Jan. 2024.

Table 1: Washington state pertussis cases by age group for 2024 (weeks 1 - 45). The top three rates per 100k patients belong to age groups of less than one, one to four, and 14-18 years old.

Table 2: Total number of Washington state pertussis cases in 2024 (weeks 1 - 45) listed by county reporting the greatest number (Clark with 458 cases) to lowest (Lincoln, Mason, San Juan, and Skamania with one each).

Figure 3: County map showing six-week pertussis incidence rates from weeks 39 - 45.

#WADOH 's weekly report for #Pertussis ( #WhoopingCough )
doh.wa.gov/sites/defaul...