Faculty profile

Catharine Chambers

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Adjunct LecturerEpidemiology DivisionUniversity of Toronto

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Latest papers

Uptake of Influenza, Pneumococcal, and COVID-19 Vaccines Among People Living with HIV: Findings from the Ontario HIV Treatment Network Cohort Study
AIDS and Behavior · 2026 · first author
SARS-CoV-2 breakthrough infection among people with and without HIV in Ontario, Canada
AIDS · 2026
Public health unit perspectives on challenges, barriers, and lessons learned from Ontario’s 2024–2025 measles outbreak: a mixed-methods survey
Canadian Journal of Public Health · 2026 · first author

All 35 publications

Latest funding

Burden of COVID-19 among people living with HIV in Ontario
CIHR · 2020 · Co-investigator
$768,825
Effectiveness of human papillomavirus vaccine in gay, bisexual and other men who have sex with men
CIHR · 2019 · Co-investigator
$569,924

All 2 grants and awards

35 publications.

Uptake of Influenza, Pneumococcal, and COVID-19 Vaccines Among People Living with HIV: Findings from the Ontario HIV Treatment Network Cohort Study

Chambers C, Bekele T, Grewal R, Kovacs C, Mbuagbaw L, Ndung’u M, Record D, Wilson SE, Kroch A, Burchell AN

AIDS and Behavior2026First author

DOI: 10.1007/s10461-026-05237-9

SARS-CoV-2 breakthrough infection among people with and without HIV in Ontario, Canada

Freitas C, Cooper CL, Kroch AE, Buchan SA, Moineddin R, Arbess G, Benoit AC, Chambers C, Habanyama M, Kendall CE

AIDS2026

DOI: 10.1097/qad.0000000000004351

Public health unit perspectives on challenges, barriers, and lessons learned from Ontario’s 2024–2025 measles outbreak: a mixed-methods survey

Chambers C, Sarmiento J, Nguyen-Orlando M, Brown EM, Harris T, Morrison R, Navarro C, Wilson SE, Pernica JM, Hopkins JP

Canadian Journal of Public Health2026First author

DOI: 10.17269/s41997-026-01253-3

HPV vaccine effectiveness against prevalent HPV by age, years sexually active before vaccination, and HIV status in gay, bisexual, and other men who have sex with men, 2019-2021.

Khayargoli P, Grace D, Cox J, de Pokomandy A, Grennan T, Hart TA, Moineddin R, Moore DM, Chambers C, Deeks SL, Grewal R, Jollimore J, Lachowsky NJ, Nisenbaum R, Ogilvie G, Sauvageau C, Tan DHS, Yeung A, Zhang T, Coutlée F, Burchell AN

The Journal of infectious diseases2026

DOI: 10.1093/infdis/jiag426 PMID: 42642045

COVID-19 vaccine uptake in a retrospective population-based cohort of people living with and without HIV in Ontario, Canada

Freitas C, Cooper CL, Kroch AE, Moineddin R, Arbess G, Benoit AC, Buchan SA, Chambers C, Habanyama M, Kendall CE

Vaccine20255 citations

DOI: 10.1016/j.vaccine.2025.127422

Gaps in immunization coverage at school entry and after two years of school attendance among immigrant and refugee children in Ontario, Canada.

Wilson SE, Chambers C, Wilton AS, Bai L, Crowcroft N, Deeks SL, Halperin SA, Kwong JC, Rashid M, Tu K, Wilson K, Guttmann A

PloS one2025

DOI: 10.1371/journal.pone.0330955 PMID: 40924695

Coronavirus disease 2019 outcomes in a population-based cohort of people with HIV and a matched cohort of people without HIV during Omicron variant waves

Chambers C, Cooper CL, Kroch AE, Buchan SA, Kendall CE, Kwong JC, Moideddin R, Nguyen L, Arbess G, Benoit AC

AIDS20242 citationsFirst author

DOI: 10.1097/qad.0000000000003922

Correlates of Breakthrough SARS-CoV-2 Infections in People with HIV: Results from the CIHR CTN 328 Study.

Costiniuk CT, Lee T, Singer J, Galipeau Y, Arnold C, Langlois MA, Needham J, Jenabian MA, Burchell AN, Samji H, Chambers C, Walmsley S, Ostrowski M, Kovacs C, Tan DHS, Harris M, Hull M, Brumme ZL, Lapointe HR, Brockman MA, Margolese S, Mandarino E, Samarani S, Lebouché B, Angel JB, Routy JP, Cooper CL, Anis AH, COVAXHIV Study Group

Vaccines2024

DOI: 10.3390/vaccines12050447 PMID: 38793698

Sex differences in COVID-19 vaccine confidence in people living with HIV in Canada.

Lu J, Vulesevic B, Burchell AN, Singer J, Needham J, Yang Y, Qian H, Chambers C, Samji H, Colmegna I, Del Canto S, Godin GH, Habanyama M, Hui SSC, Kroch A, Mandarino E, Margolese S, Martin C, Owino M, Lau E, Mohammadi T, Zhang W, Pelaez S, Kovacs C, Benko E, Cooper CL, Anis AH, Costiniuk CT, COVAXHIV Study Group

Vaccine: X2024

DOI: 10.1016/j.jvacx.2024.100566 PMID: 39582795

Prevalence of Oral Human Papillomavirus Infection Among Urban Gay, Bisexual, and Other Men Who Have Sex With Men in Canada, 2017-2019.

Alessandrini J, Cox J, de Pokomandy A, Hart TA, Grace D, Grennan T, Moore D, Lambert G, Chambers C, Deeks SL, Grewal R, Lachowsky NJ, Sauvageau C, Tan DHS, Coutlée F, Burchell AN, Engage-HPV Team

The Journal of infectious diseases2024

DOI: 10.1093/infdis/jiae345 PMID: 39041706

Profile data last refreshed on July 30, 2025 from the university directory, publication records and CIHR, NSERC and SSHRC funding.

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Catharine Chambers

Latest papers

Latest funding

Uptake of Influenza, Pneumococcal, and COVID-19 Vaccines Among People Living with HIV: Findings from the Ontario HIV Treatment Network Cohort Study

SARS-CoV-2 breakthrough infection among people with and without HIV in Ontario, Canada

Public health unit perspectives on challenges, barriers, and lessons learned from Ontario’s 2024–2025 measles outbreak: a mixed-methods survey

HPV vaccine effectiveness against prevalent HPV by age, years sexually active before vaccination, and HIV status in gay, bisexual, and other men who have sex with men, 2019-2021.

COVID-19 vaccine uptake in a retrospective population-based cohort of people living with and without HIV in Ontario, Canada

Gaps in immunization coverage at school entry and after two years of school attendance among immigrant and refugee children in Ontario, Canada.

Coronavirus disease 2019 outcomes in a population-based cohort of people with HIV and a matched cohort of people without HIV during Omicron variant waves

Correlates of Breakthrough SARS-CoV-2 Infections in People with HIV: Results from the CIHR CTN 328 Study.

Sex differences in COVID-19 vaccine confidence in people living with HIV in Canada.

Prevalence of Oral Human Papillomavirus Infection Among Urban Gay, Bisexual, and Other Men Who Have Sex With Men in Canada, 2017-2019.

Burden of COVID-19 among people living with HIV in Ontario

Effectiveness of human papillomavirus vaccine in gay, bisexual and other men who have sex with men

Frequent collaborators

Hasina Samji

Rosane Nisenbaum

Abigail Kroch

Ramandip Grewal

Sharon Walmsley

Lawrence Mbuagbaw

Daniel Grace

Gina Ogilvie

Alexandra de Pokomandy

Gordon Arbess

Rahim Moineddin

Jean-Pierre Routy

Mario Ostrowski

Patricia O’Campo

Rinku Sutradhar

Mark Hull

Aslam Anis

Jason Wong

Mohammad-Ali Jenabian

Shari Margolese

Sergio Rueda

Christine Navarro

Blair Wheaton

Maritt Kirst