Faculty profile

Jessica Breznik

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Lecturer (Adjunct)MedicineMcMaster University

Research

Research areas, by share of publications

Research areas are derived from OpenAlex topics of their publications.

37 publications.

01

Humoral and cellular immunogenicity of sequential heterogeneous bivalent SARS-CoV-2 vaccinations in long-term care and retirement home residents

Breznik JA, Ang JC, Bhakta H, Liu L-M, Bilaver L, Kennedy AE, Cowbrough B, Rahim A, Clare R, Bramson JL

Vaccine20261 citationsFirst author
DOI: 10.1016/j.vaccine.2025.128160
02

Assessing SARS-CoV-2 immune markers in vaccinated asymptomatic adults after household exposure in Canada (AB-PROTECT): a prospective cohort study

Kandel C, Breznik JA, Taylor M, Colwill K, Hu Q, Llanes A, Crowl G, Elliott HD, Shi G, Li XA

The Lancet Microbe2026
DOI: 10.1016/j.lanmic.2026.101500
03

Maternal diet-induced excess adiposity programs multisystem vulnerability that is unmasked by postnatal infection challenge

Ribeiro T, Warmington A, Yeo E, Bellissimo C, Kennelly B, Cowbrough B, Jazwiec P, Breznik J, DeJong E, Kennedy K

2026
DOI: 10.21203/rs.3.rs-9733486/v1
04

Rationalizing recommendations for influenza and COVID-19 vaccines

Breznik JA, Miller MS, Bowdish DME

Vaccine20258 citationsFirst author
DOI: 10.1016/j.vaccine.2025.127775
05

No evidence of immune exhaustion after repeated SARS-CoV-2 vaccination in vulnerable and healthy populations

Benoit JM, Breznik JA, Wu Y, Kennedy A, Liu L-M, Cowbrough B, Baker B, Hagerman M, Andary CM, Mushtaha M

Nature Communications20257 citations
DOI: 10.1038/s41467-025-60216-3
06

Author Correction: No evidence of immune exhaustion after repeated SARS-CoV-2 vaccination in vulnerable and healthy populations

Benoit JM, Breznik JA, Wu Y, Kennedy A, Liu L-M, Cowbrough B, Baker B, Hagerman M, Andary CM, Mushtaha M

Nature Communications2025
DOI: 10.1038/s41467-025-61098-1
07

Minimal Impact of Prior Common Cold Coronavirus Exposure on Immune Responses to Severe Acute Respiratory Syndrome Coronavirus 2 Vaccination or Infection Risk in Older Adults in Congregate Care

Breznik JA, Cowbrough B, Bilaver L, Dushoff M, Stacey HD, Ang J, Clare R, Kennedy A, Costa AP, Nazy I

Open Forum Infectious Diseases2025First author
DOI: 10.1093/ofid/ofaf178
08

Working together: a multi-component intranasal vaccine provides synergistic protection against COVID-19

Breznik JA, Verschoor CP

Signal Transduction and Targeted Therapy2025First author
DOI: 10.1038/s41392-025-02508-0
09

Neutrophil-mediated innate immune resistance to bacterial pneumonia is dependent on Tet2 function

Quin C, DeJong EN, Cook EK, Luo YZ, Vlasschaert C, Sadh S, McNaughton AJM, Buttigieg MM, Breznik JA, Kennedy AE

Journal of Clinical Investigation202427 citationsOpen Access
DOI: 10.1172/jci171002PMID: W4393930112
10

Monocyte-driven inflamm-aging reduces intestinal barrier function in females

Quin C, Breznik JA, Kennedy AE, DeJong EN, Andary CM, Ermolina S, Davidson DJ, Ma J, Surette MG, Bowdish DME

Immunity and Ageing202422 citations
DOI: 10.1186/s12979-024-00469-6

Courses taught

1

  • Advanced Concepts in Immunology

    HTHSCI 4II3 · last taught 2025

    Undergraduate

Frequent collaborators

33
Jessica BreznikDawn BowdishIshac NazyMatthew S MillerAndrew CostaJonathan BramsonChris VerschoorDeborah SlobodaJudah Aryeh DenburgMargaret LarcheDarryl LeongJonathan Schertzer
Co-authors at McMaster University. Thicker lines mean more shared papers.Explore the network

Dawn Bowdish

Medicine

34 shared papers, latest 2026

Ishac Nazy

Medicine

18 shared papers, latest 2026

Matthew S Miller

Biochemistry & Biomedical Sciences

17 shared papers, latest 2026

Jonathan Bramson

Medicine

16 shared papers, latest 2026

Andrew Costa

Health Research Methods, Evidence, and Impact

16 shared papers, latest 2026

Chris Verschoor

Medicine

11 shared papers, latest 2026

Researchers with similar interests

Zain Chagla

Medicine

SARS-CoV-2 and COVID-19 Research, Long-Term Effects of COVID-19

Jacqueline Solomon

Medicine

SARS-CoV-2 and COVID-19 Research, Long-Term Effects of COVID-19

Matthew S Miller

Biochemistry & Biomedical Sciences

SARS-CoV-2 and COVID-19 Research

Rebecca Kruisselbrink

Medicine

Long-Term Effects of COVID-19, SARS-CoV-2 and COVID-19 Research

Xiao Xia Tiffany Shao

Pathology & Molecular Medicine

SARS-CoV-2 and COVID-19 Research

Dawn Bowdish

Medicine

SARS-CoV-2 and COVID-19 Research

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A short, specific email works best. This draft uses one of their recent papers; replace the parts in brackets with your own details before sending.

Applying for
Subject: Prospective PhD student: SARS-CoV-2 and COVID-19 Research Dear Professor Breznik, My name is [your name], and I am a [your current degree or role] at [your institution]. I am applying for a PhD position starting in [term and year]. I read your paper "Humoral and cellular immunogenicity of sequential heterogeneous bivalent SARS-CoV-2 vaccinations in long-term care and retirement home residents" (2026), and it connects closely to my own work on [your research topic]. [One or two sentences on what you did and what you learned.] Are you accepting new PhD students for [term and year]? I have attached my CV and transcripts, and I would be glad to talk at a time that suits you. Thank you for your time. Kind regards, [your name]
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