Chadi Saad-Roy

Very excited to share our latest paper, with my terrific student @prakharj.bsky.social, and wonderful collaborators Dan Coombs, Caroline Wagner, and @troyday.bsky.social We use simple models to explore how interventions could mitigate post-infection morbidity www.pnas.org/doi/10.1073/...

New paper out in @pnas.org. Highlighting the importance of interventions like vaccination in mitigating the post-infection morbidity. www.pnas.org/doi/10.1073/... @chadisaadroy.bsky.social, Coombs, Wagner & @troyday.bsky.social @carlbergstrom.com #vaccine #diseases #PublicHealth #HealthEconomics

Happy to share our article in @natmicrobiol.nature.com www.nature.com/articles/s41.... Acute infections can leave lasting imprints on chronic disease risk, health, and aging. We argue that vaccine evaluation should capture protection against both acute illness and its long-term consequences.

UBC's Dr. Kayla King delivered the Francis Crick Lecture at the Royal Society in London on the implications of her research for predicting pathogen virulence and patterns of genomic evolution in a changing world. @royalsociety.org @ubcmicroimmuno.bsky.social @zoology.ubc.ca bit.ly/4zVnElR

Most animal species pack sperm DNA with protamines instead of histones. Protamines are essential for male fertility. They are among the fastest-evolving genes in animals. That makes little sense. We think we know why, in a new paper led by @ching-hochang.bsky.social. www.science.org/doi/10.1126/...

Please RT: Do you use math to address interesting biological problems? Join us at Vanderbilt BioSci! We are conducting an open-rank TT search in Theoretical Biology: apply.interfolio.com/194619. We are a friendly and collaborative department with interests spanning a range of biological disciplines!

Interested in complex systems research in beautiful Vermont? Teams @vcsi.bsky.social hope to fill postdoctoral positions on very short notice. One position is at the intersection of cognitive and epidemiological modeling. DM for details or keep an eye out for postings on here.

Hi Everyone! I will be broadcasting live from the Social Lives of Viruses 2026 conference @zoology.ubc.ca @ubcbiodiversity.bsky.social in beautiful Vancouver BC, organized by @asherleeks.bsky.social and myself with the support of Canadian Institutes of Health Research and @moorefound.bsky.social.

New King lab paper @currentbiology.bsky.social led by the brilliant @luismsilva.bsky.social on parasite shedders and spreaders: www.cell.com/current-biol...

New paper out in @currentbiology.bsky.social ! 🎉 Who drives disease transmission? The answer seems obvious: measure who releases or disperses the most parasites. But after dissecting transmission step by step, we found that’s often not the case. 👇 🧵 #EvoSky #IDSky www.cell.com/current-biol...

What can we learn from disruptions of seasonal patterns of disease during the pandemic? A new paper by @michaelsieber.bsky.social in PLOS Global Public Health, journals.plos.org/globalpublic..., was featured in the German news such as @zeit.de or @spiegel.de - and may be of interest also here. 1/3

Avocados come in 2 varieties - A-types start each day female and switch to male midday. B-types do the reverse. In work just published from the last chapter of my PhD, we show this system evolved 40+million yrs ago and is regulated by alleles of 1 transcription factor www.pnas.org/doi/10.1073/...

1/🧵 Excited to finally share my latest paper (and my first solo paper)! 🎉 Pathogens evolve. Hosts respond. But does pathogen evolution simply change the magnitude of the host response, or does it reshape which host programmes are activated? 🤔 👇 doi.org/10.1038/s420... #Anopheles #EvoSky

Our scoping review "Emerging frontiers in infectious disease modelling: reassessing the data-driven feedback loop between human behaviour and disease dynamics" is out now! From a group of epidemiologists, behavioural scientists, & mathematicians. royalsocietypublishing.org/rsos/article...

Have ideas for your own, independent research program in Theoretical Biology? Then come and join us as a Group Leader at the @mpi-evolbio.bsky.social in Plön, Germany!

A new primer in @microbiologysociety.org on epidemic exponential growth with @bnashby.bsky.social @chadisaadroy.bsky.social and Dan Coombs: www.microbiologyresearch.org/content/jour... Fun collaboration!

I'm very excited to share this preprint led by @sorenlouislarsen.bsky.social and Chloe Yand, and made possible by the collaboration with my friend and colleague @ayesha-mahmud.bsky.social. www.medrxiv.org/content/10.6...

Excited to share our new preprint on noise and determinism in Trinidadian guppy population dynamics! Thanks to all collaborators: Ron, Joe, Arshed, Dave & Simon. We develop a framework for quantifying how stochasticity alters equilibrium structure, stability and vulnerability to perturbations. 1/5

Paper is now published in @journal-evo.bsky.social: doi.org/10.1093/evol...

Thermal variability alone promotes adaptation but competition can restrict evolutionary responses in viral parasites By @kayla-king.bsky.social @craigmaclean.bsky.social and others not on Bsky. doi.org/10.1093/evle...

We're recruiting! We're looking for two graduate students to join us at UBC in Vancouver. Fully funded and open to global applicants, with flexible start-date. Topics include theory, bioinformatics, and microbiology. More details: asherleeks.com/apply #socialviruses #evosky #virosky 🧪

Excited to share our new paper out today in @natcomms.nature.com Combining multiplex serology, mathematical modelling, and experimental validation reveals arbovirus transmission dynamics despite cross-reactivity. (1/2)

The Social Lives of Viruses is coming to Vancouver, Canada, from 4th-8th August 2026! This is a free meeting dedicated to all aspects of virus-virus interactions & evolution. To apply: socialviruses.zoology.ubc.ca @sociovirology.bsky.social #socialviruses #evosky #lovevirology #virosky

Honoured to have been involved in this collaboration, led by the dream team of Kylee Hoffman and @ayesha-mahmud.bsky.social

This pre-printed article discusses insect oviposition as a tractable, mechanistically grounded model for behavioural immunity, linking individual egg-laying decisions to population level disease dynamics. 🪰🦠 doi.org/10.32942/X2W...

I am happy to share this new preprint with Yuxuan Zhao, Kaisheng Zhu, and Yefei Zhang on Pattern Formation in a Spatial Public Goods Dilemma due to Diffusive or Directed Motion. arxiv.org/abs/2603.21025

For the MMEE 2026 in Cork www.ucc.ie/en/matsci/ev... note the updated deadline! Submission of talks and poster presentations: March 30th, 2026.

Had fun talking with @websedgescience.bsky.social at the #APSSummit26 on how physics & math can explain fashion cycles! @aps-dsnp.bsky.social @stevenstrogatz.com

The need to preserve animal culture in conservation efforts. 🪶 Gift link.

A nice collaboration from post-docs in my lab 😊 onlinelibrary.wiley.com/doi/full/10.... @jingdi.bsky.social @luismsilva.bsky.social @paradyseb.bsky.social @molecularecolup.bsky.social

Very excited to share our latest article in Trends in Microbiology, with @ninan-abraham.bsky.social, @chilbe.bsky.social, @ayesha-mahmud.bsky.social, and Arne Traulsen! We highlight the importance of disentangling these interactions and suggest potential paths forwards

Kea! 🪶

Dont miss the ESPIDAM summer program in June 2026 in Stockholm, covering many key concepts for ID modelling: stochastic models, AI for ID control, nowcasting and forecasting, phylodynamics, data analysis, network models, within-host models, health economics www.statistics.su.se/english/divi...

Happy to share our new paper in PLOS Biology journals.plos.org/plosbiology/... Showed that population bottlenecks don't uniformly drive “cooperation” but rather selectively shape which cooperative traits evolve #evolution #ecology #microbiology @vishuguttal.bsky.social @iamsamayp.bsky.social

Looking for a faculty job at one of the world's great research stations? We're looking for a marine invertebrate biologist at UW's Friday Harbor Labs. apply.interfolio.com/178804

Recently had the chance to hear @carlbergstrom.com on information foraging in the current space of LLMs. He and @jevinwest.bsky.social have crafted a course that touches various facets of LLMs. Just finished reading through its 18 modules. Absolutely loved it! thebullshitmachines.com

Its very exciting to see this paper out in @behavecol.bsky.social. These conversations, expertly led by @delphinedemoor.bsky.social, have really shaped how I now think about working with social network data. Check out Delphine's thread to learn more!

Super excited that the bulk of my PhD work is now preprinted! Here we used whole-community competition, or coalescence, experiments to quantify selection acting on genetically diverged strains within larger communities. (1/n) www.biorxiv.org/content/10.1...

2 job adverts on a NERC project w myself + @darrenobbard.bsky.social on “What determines the virome: ecology and the environment, evolution, or species history?” early 2026 in @uniexecec.bsky.social - Postdoc: jobs.exeter.ac.uk/hrpr_webrecr... - RA: jobs.exeter.ac.uk/hrpr_webrecr... Pls share!

I'm really excited to see this paper by @fernpizza.bsky.social, @baym.lol, et al. This is a great model system for studying multilevel selection, and the experimental work builds nicely on cross-scale theoretical modeling approaches that I've enjoyed learning about over the past few years. 🧵

I'm super excited to have joined @ubcmath.bsky.social and @ubcmicroimmuno.bsky.social !! Please get in touch if you might be interested in graduate studies or postdoctoral research opportunities!

This piece on infection history as a driver of individual heterogeneity in infection outcomes was fun to think about and to write with @chadisaadroy.bsky.social and Mike Boots. Also suggest that systems like #Drosophila can offer useful tools to tackle the epidemiological consequences.

I am really happy to share that there will be a @nitmb.bsky.social workshop next year on mathematical and biological features of evolutionary game theory. It was really fun to co-organize this workshop with Olivia Chu, Alex McAvoy, and @jplotkin.bsky.social. www.nitmb.org/evolutionary...

Out today in Science: Our work on tropical cyclones and malaria in Madagascar. Work inspired by many and done in collaboration with many www.science.org/doi/10.1126/...

Corina Tarnita and I have discussed the relation between theoretical ecology and evolutionary game theory since my sabbatical in 2022. Now the paper is out, doi.org/10.1073/pnas... Cooperation in nature may not be mysterious when there are growth differences- questioning the notion of cooperation.

Come join us at beautiful UBC! The King Lab is recruiting a Post-doc Fellow to develop mathematical theory on infectious disease evolution and emergence, together with Ben Ashby (SFU) #zoonoses #biodiversity www.zoology.ubc.ca/kinglab/join...

I’m really thrilled to announce that I will join the University of British Columbia in September as an Assistant Professor in @ubcmath.bsky.social and @ubcmicroimmuno.bsky.social! Please get in touch if you might be interested in graduate studies or postdoctoral research opportunities!

Today @billhanage.bsky.social and I have a commentary in PNAS, where we discuss the role of factors other than acquired immunity in generating bell-shaped epidemic curves. Our purpose is to provide context for Saad-Roy and Traulsen's model of human behavior and disease dynamics in the same issue.