The studies behind the firm
The people at Epidemic Intelligence built the studies below, most of them through the CUNY Institute for Implementation Science in Population Health with funding from the National Institutes of Health, the CDC and others. They are the reason we know this work can be done, and done fast. Work delivered by Epidemic Intelligence itself is marked as such.
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NationalTeam track record
Project PROTECTS
A national cohort study that used multi-pathogen, at-home self-testing to track acute and post-acute outcomes of influenza A, influenza B, RSV and SARS-CoV-2 infections. Data collection is complete; analyses and publications are ongoing. Study page.
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From March 2020Team track record
CHASING COVID Cohort
One of the first national online cohorts of the pandemic, launched in March 2020 with participants across all 50 states, repeated surveys and at-home dried blood spot serology. Public-use data are released on Zenodo. Study page.
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2022 to 2026Team track record
NYC hospital wastewater surveillance
With NYC Health + Hospitals, the team built passive-sampler wastewater surveillance across public hospitals for SARS-CoV-2, expanding to influenza, mpox, polio and metagenomic sequencing. In 2026 the program ran sentinel surveillance across wastewater, air and surface samples at Elmhurst and Jacobi hospitals during the FIFA World Cup.
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New York CityTeam track record
Ryan White HIV care program evaluations
With the New York City Department of Health and Mental Hygiene, the team has evaluated the city's Ryan White Part A HIV care programs, including the Care Coordination Program, the PROMISE stepped-wedge trial of a revised care coordination model, and Data to Suppression (D2S).
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OngoingEpidemic Intelligence
Ending the HIV Epidemic data dashboards
Technical assistance and expert advice on the design and development of public data systems for Ending the HIV Epidemic, delivered by Epidemic Intelligence. The team also built New York State's Ending the Epidemic dashboard at CUNY.
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Since 2004Team track record
HIV care and treatment cohorts in sub-Saharan Africa
Through the IeDEA consortium and earlier work beginning at the CDC, Denis Nash has led and collaborated on large-scale studies of HIV care and treatment scale-up in more than 20 sub-Saharan African countries, much of it in connection with the U.S. President's Emergency Plan for AIDS Relief (PEPFAR). He co-leads Central Africa IeDEA.
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2020 to 2022Epidemic Intelligence
Pandemic advisory
Epidemic Intelligence advised businesses, schools and universities in New York on testing strategy, outbreak management and safe operations during COVID-19.
Selected papers
Denis Nash has published more than 370 peer-reviewed papers. A few from the work above:
- BMJ Open, 2026Project PROTECTS: a community-based, prospective study of respiratory outcomes
- BMJ Open, 2021Cohort profile: a national, community-based prospective cohort study of SARS-CoV-2 pandemic outcomes in the USA, the CHASING COVID Cohort study
- PLOS Medicine, 2024Long-term HIV care outcomes under universal HIV treatment guidelines: a retrospective cohort study in 25 countries
- Vaccine, 2026Effect of a third COVID-19 vaccine dose on the incidence of long COVID: a target trial emulation in a community-based cohort
- International Journal of Infectious Diseases, 2026Natural history of self-reported symptoms following SARS-CoV-2 infection: a target trial emulation in a prospective community-recruited cohort
- Clinical Infectious Diseases, 2015Improvements in HIV care engagement and viral load suppression following enrollment in a comprehensive HIV care coordination program
Full list on Google Scholar.