Irene Armstrong, University of Toronto

Latest papers

Incidence of colonization and infection with carbapenemase-producing Enterobacterales in Toronto and Peel Region, Ontario, 2007-2024.
JAMMI · 2026
Invasive Group A Streptococcal Disease in Persons Experiencing Postpandemic Homelessness in Canada
JAMA Network Open · 2026
Invasive Group A Streptococcal Infection in Children, 1992-2023
JAMA Network Open · 2025

All 8 publications

Latest funding

The epidemiology of the emergence of carbapenemase resistance in Enterobacteriaceae in southern Ontario
CIHR · 2013 · Co-investigator
$1,067,761

All 1 grants and awards

8 publications.

01

Incidence of colonization and infection with carbapenemase-producing Enterobacterales in Toronto and Peel Region, Ontario, 2007-2024.

Li AX, Lefebvre M, Zhong Z, Almohri H, Armstrong I, Baqi M, Barker KR, Borgia S, Coleman BL, Downing M

JAMMI2026

DOI: 10.3138/jammi-2025-0027

02

Invasive Group A Streptococcal Disease in Persons Experiencing Postpandemic Homelessness in Canada

Kassee C, Dabaja-Younis H, Richard L, Golden AR, Zhong Z, Allen V, Almohri H, Armstrong I, Baqi M, Barker KR

JAMA Network Open2026

DOI: 10.1001/jamanetworkopen.2025.57932

03

Invasive Group A Streptococcal Infection in Children, 1992-2023

Dabaja-Younis H, Kandel C, Green K, Johnstone J, Zhong Z, Kassee C, Allen V, Armstrong I, Baqi M, Barker K

JAMA Network Open202526 citations

DOI: 10.1001/jamanetworkopen.2025.2861

04

Group A streptococcal outbreak in a geriatric mental health unit.

Younis HD, Johnstone J, Armstrong I, Brown EE, Golden A, Griffith A, Martin I, Donnait K, Nur M, Mesfin E, Kus JV, McGeer A, Logan R

American journal of infection control2024

DOI: 10.1016/j.ajic.2024.06.011 PMID: 38925503

05

Burden of Severe Illness Associated With Laboratory-Confirmed Influenza in Adults Aged 50-64 Years, 2010-2011 to 2016-2017.

Kim P, Coleman B, Kwong JC, Plevneshi A, Hassan K, Green K, McNeil SA, Armstrong I, Gold WL, Gubbay J, Katz K, Kuster SP, Lovinsky R, Matukas L, Ostrowska K, Richardson D, McGeer A

Open forum infectious diseases2023

DOI: 10.1093/ofid/ofac664 PMID: 36632417

06

Household Transmission of Carbapenemase-producing Enterobacterales in Ontario, Canada.

Jamal AJ, Faheem A, Farooqi L, Zhong XZ, Armstrong I, Boyd DA, Borgundvaag E, Coleman BL, Green K, Jayasinghe K, Johnstone J, Katz K, Kohler P, Li AX, Mataseje L, Melano R, Muller MP, Mulvey MR, Nayani S, Patel SN, Paterson A, Poutanen S, Rebbapragada A, Richardson D, Sarabia A, Shafinaz S, Simor AE, Willey BM, Wisely L, McGeer AJ

Clinical infectious diseases : an official publication of the Infectious Diseases Society of America2021

DOI: 10.1093/cid/ciaa1295 PMID: 32869855

07

Dissemination of Verona Integron-encoded Metallo-β-lactamase among clinical and environmental Enterobacteriaceae isolates in Ontario, Canada

Kohler P, Tijet N, Kim HC, Johnstone J, Edge T, Patel SN, Seah C, Willey B, Coleman B, Green K

Scientific Reports202031 citations

DOI: 10.1038/s41598-020-75247-7

08

Population-Based Surveillance for Invasive Pneumococcal Disease in Homeless Adults in Toronto

Plevneshi A, Svoboda T, Armstrong I, Tyrrell GJ, Miranda A, Green K, Low D, McGeer A

PLoS ONE200944 citations

DOI: 10.1371/journal.pone.0007255

The epidemiology of the emergence of carbapenemase resistance in Enterobacteriaceae in southern Ontario

Co-investigatorCIHR2013Operating Grant

Principal investigators: McGeer, Allison J

Keywords: Antibiotic Resistance; Carbapenem; Enterobacteriaceae; Epidemiology

$1,067,761

From CIHR, NSERC and SSHRC funding decisions: CIHR since 2008, NSERC since 1991 and SSHRC since 1998, including their latest published competition results.

Frequent collaborators

Department of Laboratory Medicine and Pathobiology
Pathology & Molecular Medicine
Clinical Public Health Division
Medicine
Epidemiology Division
Institute of Biomaterials and Biomedical Engineering
Department of Epidemiology and Biostatistics
Other

1 shared papers, latest 2023

Write to this professor

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

Paper to mention

Subject: Prospective PhD student Dear Professor Armstrong, 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 "Incidence of colonization and infection with carbapenemase-producing Enterobacterales in Toronto and Peel Region, Ontario, 2007-2024." (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]