Sublinear and linear scaling coexist in bipartite graphs

Real ecological networks are constrained by the presence of specialists

Coextinction risk is driven by host extinction risk - but especially high for specialists

‼️ New preprint: By solving a paradox in graph theory, we show that specialist symbionts constrain ecosystem structure, drive biodiversity, and face high extinction risk. With @jbyoder.org and @ctrlalttim.com:

🎉 Specialists drive biodiversity scaling in symbiotic relationships

Climate change in the WHO Pandemic Agreement negotiations: a qualitative study. Graph shows the evolution of different topics over different articles.

NEW PREPRINT! 🦠⚖️🌡️ The Pandemic Agreement is the first global health treaty to name climate change, and behind the scenes, the UNFCCC was a source of both inspiration and conflict. Cristina Arnés-Sanz and team tracked climate issues through three years of negotiations: papers.ssrn.com/sol3/papers....

Health losses attributed to anthropogenic climate change This study highlights the growing body of evidence that quantifies the health losses directly attributable to anthropogenic climate change, with emphasis on mortality, illness and wider well-being imp...

Our 2025 paper 'Health losses attributed to anthropogenic climate change' was featured on UNDRR's PreventionWeb: www.preventionweb.net/publication/...

Cecilia Sanchez presents a slide showing geographic gaps in sampling effort

Hailey Robertson presents on arbovirus enzootic cycles

New work in progress on primate reservoirs of arboviruses - when do they actually matter for transmission? and where will climate change take them - on display at the Vector-Borne and Zoonotic Diseases Symposium last Friday!

A long-term dream of mine has been to bridge @viralemergence.org's work on AI/ML-driven viral risk assessment with AI/ML-driven work on drug discovery. This would make a great topic for this fellowship here at Yale! If you're interested in applying, reach out. medicine.yale.edu/biomedical-d...

We’re Hiring! — Verena The Verena Institute is looking for a full stack developer or full stack development team (hereafter, the “Supplier”) to assist with the maintenance, documentation, and development of the Pathogen H...

We're looking for a full-stack developer! Help us build the best open data platforms for pandemic prediction in the world.

Probably a short-term contract, but if you're looking for a full-time gig, let's talk. Inquire within: www.viralemergence.org/blog/were-hi...

General_Instructions Instructions for Authors Authors who publish their papers under our open access model or who are NIH-funded will have their paper automatically depos

Exciting news to start 2026: for the first time ever, the PHAROS repository for wildlife disease surveillance is a journal-recommended home for your archived data!

Thanks to Integrative and Comparative Biology for taking the leap with us 🦠🔢➡️🌎💻💫 academic.oup.com/icb/pages/Ge...

Graph showing temperature anomaly and other covariates' effects on "RISc" score globally and by region

NEW!🦠🌡️ : What makes a "dengue year" like 2023-24? It's hard to pin down an answer unless you can homogenize out all the spatial variation and temporal trends. But once you do, the answer is pretty clean: dengue years are hot years.

Last one of the year (unless...?) 👉 www.medrxiv.org/content/10.6...

yale's beautiful campus from overhead

🚨 We're about to start reviewing applications, but there's still time to reach out for our postdoc position on climate change impact attribution! If you have experience with attribution science or climate epidemiology, and want to help us launch the Global Burden of Climate Change Study, reach out!

Health losses attributed to anthropogenic climate change - Nature Climate Change The authors assess the growing field of climate change health impact attribution. They show literature bias towards direct heat effects and extreme weather in high-income countries, highlighting the l...

Really interesting new paper on the rising health effects of our warming world with some great data visualizations.

Full paper here: www.nature.com/articles/s41...

Believe it or not, @alexandraphelan.bsky.social and I started talking about the concept for this workshop 5? 6? years ago, so it was absolutely amazing to finally pull this off with exactly the right people, especially in a year when it feels like we're taking a lot of L's on actionable science 🥰

Museum collections and machine learning guide discovery of novel coronaviruses and paramyxoviruses Natural history museum collections are valuable but underutilized resources for viral discovery, offering opportunities to test hypotheses about viral occurrence across space, time, and taxonomic grou...

🦇🦠 New preprint - in a long-term effort led by the amazing @mayajuman.bsky.social, we've shown that the ML tools developed by @viralemergence.org let us efficiently screen museum collections for pathogens with pandemic potential

🎉🔓 www.biorxiv.org/content/10.1...

chris callahan, alex phelan, and lizzy blackmore speaking in a group discussion

steph eaneff, angela chang, and bobby reiner speaking in a group discussion

shonali pachauri speaking in a group discussion as several people listen

a panel consisting of angela chang, nita madhav (speaking), gregg gonsalves, shweta bansal, and alex phelan. everyone is smiling

Last week's workshop on scenario development for pandemic risk assessment was a critical step forward for our broader effort on the establishment of an "IPCC for pandemics," with the UN Foundation and the National Academy of Medicine. Thank you to all of our amazing speakers and participants!

workshop group photo

Last week, we were lucky to host an international workshop on Pandemic Risk Scenarios for the 21st Century, with generous support from PAX sapiens and @viralemergence.org. Lots of lessons learned from climate and biodiversity science on how to design useful models and imagine better futures!

Check it out! New work in which we undertake the first systematic look at the science of health impact attribution, plus a great thread by @colincarlson.bsky.social below on attribution science and what we tried to accomplish with this study.

"Health losses attributed to anthropogenic climate change," a brief communication in the journal Nature Climate Change. There's a map showing regions of the world, and pie charts of relevant studies as they apply to different health impacts like "heat-related deaths" and "maternal and child health"

🚨 NEW: Climate change is already causing 30,000 deaths per year - a global annual economic loss of $100-350B USD - but the true damage is probably 10x higher. Out TODAY in Nature Climate Change: the first systematic look at the science of "health impact attribution" 🔓 www.nature.com/articles/s41...

Figure showing contact by age, gender, race or ethnicity, and setting during the pandemic and at baseline (A) Mean pandemic and baseline non-household contact rate by age. Each point represents a county-age category. Analysis was limited to counties with five or more responses per age category per week. Contact decreases with age. (B) Mean pandemic and baseline non-household contact rate by gender. Each point represents a county-gender category. Analysis was limited to counties with five or more responses per gender category per week. Contact is higher in men than women. (C) Mean pandemic and baseline non-household contact rate by race or ethnicity. Each point represents a state-race or ethnicity category. Analysis was limited to states with ten or more responses per race or ethnicity category per week. All racial and ethnic categories are non-Hispanic unless labelled otherwise. Other denotes individuals who reported their race as American Indian or Alaska Native, Native Hawaiian or Pacific Islander, or other, or as falling in multiple categories. Contact is lowest in Asian respondents, and highest in individuals reporting other or multiple race categories. (D) Mean pandemic and baseline non-household contact rate by setting. Each point represents a county-setting. Analysis was limited to counties with ten or more responses per setting per week. Contact is highest at work, followed by shopping, then social settings.

3️⃣ During the pandemic & at baseline, younger adults, men, & Hispanic & Black individuals have more contacts & are at greater disease risk

These geographic & social differences in risk can help target public health resources & surveillance 📢

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Figure showing spatial heterogeneity and urban–rural gradient of pandemic and estimated non-pandemic contact (A) Mean number of non-household contacts per person per day for each county relative to the national mean (8⋅7 contacts per person per day) during the COVID-19 pandemic (Oct 1, 2020, to April 30, 2021). There was high spatial heterogeneity in contact, even within states, which was fairly consistent across time. Counties shaded in grey did not have a sufficient sample size to estimate contact. (B) Map of inferred mean number of non-household contacts per person per day for each county relative to the national mean (10⋅9 contacts per person per day) in a non-pandemic scenario. Spatial heterogeneity in contact remains high, although which counties have values above and below the national mean has shifted compared with the pattern observed during the COVID-19 pandemic. (C) The mean contact rate (non-household contacts) for each county decreases with increasing urbanicity during the pandemic, but increases with urbanicity during inferred non-pandemic times. Only counties with ten or more responses per week each week (from Oct 1, 2020, to April 30, 2021) are included. NCHS class describes the urbanicity of the county, with 1 indicating a large central metropolitan area and 6 representing rural, non-core areas. NCHS=National Center for Health Statistics.

2️⃣ Contact patterns vary across US counties regardless of disease 🌎

Based on population density, we expected urban counties 🏙️ to have higher contact rates than rural ones 🚜

This is true at baseline, but not during the pandemic, when urban areas were more responsive to gathering restrictions

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Figure showing contact dynamics observed over time during the COVID-19 pandemic and estimated non-pandemic contact dynamics, by county (A) Mean number of daily non-household contacts for individual counties over time during the COVID-19 pandemic. Contact is presented as a Z score relative to each county’s mean to allow comparison between time series despite the large range of mean contact values across counties. Each line represents a county and is coloured by mean contact relative to the national mean. The black line shows the Z score of the centred 3-week rolling average of national COVID-19 case incidence for context. Counties had similar contact dynamics over time: most counties had higher contact during the summer of 2020, and all had lower contact during the winter of 2020–21. Counties in which contact decreased in the summer of 2020 were typically in states that had a higher incidence of COVID-19 during that time. (B) Mean contact rate (non- household contacts) in the absence of disease (baseline; slate) was effectively constant over time, compared with observed contact during the pandemic (teal), across a diverse set of counties. We controlled for disease using a linear regression model that predicts contact from national case incidence, state and county policy data, and county vaccination coverage. This analysis is restricted to Oct 1, 2020, to April 30, 2021, to encompass a full wave of COVID-19. Shaded areas represent 1 SD above and below the fitted contact value or estimated non-pandemic value.

1️⃣ Early in the pandemic, contact varied over time 📆

However, contact and COVID-19 incidence were anti-correlated during this period (when disease went ⬆️, contacts went ⬇️)

Thus, after controlling for disease, there was no longer any systematic variation in contact over time

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Screenshot of the paper titled "Characterising non-household contact patterns relevant to respiratory transmission in the USA: analysis of a cross-sectional survey"

Our paper on US contact patterns is now published in The Lancet Digital Health!

doi.org/10.1016/j.la...

Thanks to my brilliant coauthors @zsusswein.bsky.social, @vcolizza.bsky.social, & @bansallab.bsky.social for their help with this project.

Read on for an overview of our findings... 🧵

Want to do a postdoc with our group on something related to biodiversity conservation, policy, and the environment? Reach out - applications are open for the Donnelley fellowship! yibs.yale.edu/donnelley-fe...

Figure 3 of our paper, which shows viral coinfection networks at the virus level

New preprint! 🥳🎉 We looked at viral coinfection patterns at the largest scale ever in wildlife. We found a strong association among CoVs, PMVs, and influenza A, and higher coinfection rates in wildlife trade; plus, evidence that bats accumulate persistent infections. www.biorxiv.org/content/10.1...

The Global Burden of Climate Change Study

We're hiring! We have funding for a 1-year (to start with, but hopefully longer) postdoc working on climate change impacts on health broadly, and helping us launch gbcc.study. Strong skills in epi methods or attribution science needed. Can potentially be remote. Please share!

The Global Burden of Climate Change Study Working Group

We may have a one-year postdoctoral position opening! We're looking for someone with experience in attribution science OR very strong skills in climate epidemiology to come help us launch a Global Burden of Climate Change Study. Remote possible for the right person; aim to raise $ for a second year.

Ph.D. Positions and Postdoctoral Fellowships — The Carlson Lab

Up to date information for prospective fellows and students: www.carlsonlab.bio/join

The Global Burden of Climate Change Study Working Group

We may have a one-year postdoctoral position opening! We're looking for someone with experience in attribution science OR very strong skills in climate epidemiology to come help us launch a Global Burden of Climate Change Study. Remote possible for the right person; aim to raise $ for a second year.

Cryptic CAM photosynthesis in Joshua tree (Yucca brevifolia, Y. jaegeriana) Joshua trees are long-lived perennial monocots native to the Mojave Desert in North America. Composed of two species, Yucca brevifolia and Y. jaegeriana (Asparagaceae), Joshua trees are imperiled by...

Our "Joshua tree is CAM" paper is finally out: nph.onlinelibrary.wiley.com/doi/10.1111/...

Data collection started back in 2021, when we saw weird results in some RNAseq that made me stop and wonder if Joshua trees, long thought to be C3, were actually...CAM!

Hailey Robertson presenting about the role of primates in arbovirus sylvatic maintenance

Collin Schwantes presenting about how to make an effective data management plan

Colin Carlson presenting about scaling in host-virus networks

The Ekiben neighborhood bird (fried chicken) and tofu brah (fried tofu sandwich with a cool sort of carrot slaw) and a yuzu white peach soda

We had a great time at #ESA2025! Disclaimer: Ekiben sandwich not included in conference registration or ESA membership

"Conditional cash transfer could substantially contribute towards reducing AIDS-related inequalities and achieving the AIDS-related Sustainable Development Goal."

I am really excited to be a part of this team. We took our time writing this, putting a lot of thought into how our journeys as #NativesInSTEM were affected by different aspects of Universities and looking for commonalities across the world. I hope folks in academia appreciate this work.