Mark Yudin




Dr. Mark Yudin is currently a Professor at the University of Toronto and an Active Staff Physician in the Department of Obstetrics and Gynecology at St. Michael’s Hospital. He received his medical degree from the University of Toronto, and then completed his residency training in Obstetrics and Gynecology at the University of Toronto. He then completed a two-year combined clinical and research fellowship in Reproductive Infectious Diseases at Magee-Womens Hospital and the University of Pittsburgh in Pittsburgh, PA. He also received a Master’s Degree in Clinical Research from the Graduate School of Public Health and the University of Pittsburgh. He started as active staff at St. Michael’s Hospital in 2003, and his clinical and research interests include general obstetrics and gynecology, colposcopy, and infectious diseases in women. He co-founded the Positive Pregnancy Program, a comprehensive and multidisciplinary program for the care of Human Immunodeficiency Virus (HIV)-positive pregnant women, in 2006. He is the past chair of the Infectious Diseases Committee of the Society of Obstetricians and Gynecologists of Canada (SOGC), and he is a member of the Executive Working Group of the Public Health Agency of Canada Sexually Transmitted Infections Guidelines. He has lectured and published in the area of infectious diseases in women.

His major research interests include HIV in women (including during pregnancy), pregnancy planning for couples affected by HIV, infections during pregnancy (particularly influenza and hepatitis), and sexually transmitted infections and vaginitis. He has been the recipient of many major grants in these areas, including being one of the founders of and a co-primary investigator on a Canadian Institutes of Health Research grant for The Interdisciplinary HIV Pregnancy Research Group (IHPREG). IHPREG has spearheaded the research and clinical care of HIV-affected women and men in Ontario and nationally since 2011.

Please note: Dr. Yudin is not taking any summer students.

Recent Publications

  1. Biondi, MJ, Lynch, K, Floriancic, N, Cronin, K, Marchand-Austin, A, Mendlowitz, AB et al.. Evaluation of Prenatal Hepatitis C Virus Prevalence Using Universal Screening, and Linkage to Care in a Real-World Setting in Ontario. J Obstet Gynaecol Can. 2024;46 (6):102423. doi: 10.1016/j.jogc.2024.102423. PubMed PMID:38452927 .
  2. Koebel, J, Kazemi, M, Kennedy, VL, Medeiros, P, Bertozzi, B, Bevan, L et al.. Dissemination of the Women-Centred HIV Care Model: A Multimodal Process and Evaluation. J Int Assoc Provid AIDS Care. 2024;23 :23259582231226036. doi: 10.1177/23259582231226036. PubMed PMID:38389331 PubMed Central PMC10894538.
  3. Levison, J, McKinney, J, Duque, A, Hawkins, J, Bowden, EVH, Dorland, J et al.. Breastfeeding Among People With Human Immunodeficiency Virus in North America: A Multisite Study. Clin Infect Dis. 2023;77 (10):1416-1422. doi: 10.1093/cid/ciad235. PubMed PMID:37078712 PubMed Central PMC10654886.
  4. Khan, S, Tsang, KK, Brophy, J, Kakkar, F, Kennedy, VL, Boucoiran, I et al.. Canadian Pediatric & Perinatal HIV/AIDS Research Group consensus recommendations for infant feeding in the HIV context. J Assoc Med Microbiol Infect Dis Can. 2023;8 (1):7-17. doi: 10.3138/jammi-2022-11-03. PubMed PMID:37008587 PubMed Central PMC10052908.
  5. Clarfield, L, Little, D, Svendrovski, A, Yudin, MH, De Souza, LR. Single-Centre Retrospective Cohort Study of Demographic Characteristics and Perinatal Outcomes in Pregnant Refugee Patients in Toronto, Canada. J Immigr Minor Health. 2023;25 (3):529-538. doi: 10.1007/s10903-022-01447-0. PubMed PMID:36637689 .
  6. Harris, K, Proctor, LK, Shinar, S, Philippopoulos, E, Yudin, MH, Murphy, KE et al.. Outcomes and management of pregnancy and puerperal group A streptococcal infections: A systematic review. Acta Obstet Gynecol Scand. 2023;102 (2):138-157. doi: 10.1111/aogs.14500. PubMed PMID:36636775 PubMed Central PMC9889326.
  7. Ronzoni, S, Boucoiran, I, Yudin, MH, Coolen, J, Pylypjuk, C, Melamed, N et al.. Guideline No. 430: Diagnosis and management of preterm prelabour rupture of membranes. J Obstet Gynaecol Can. 2022;44 (11):1193-1208.e1. doi: 10.1016/j.jogc.2022.08.014. PubMed PMID:36410937 .
  8. Cheu, RK, Mohammadi, A, Schifanella, L, Broedlow, C, Driscoll, CB, Miller, CJ et al.. Altered Innate Immunity and Damaged Epithelial Integrity in Vaginal Microbial Dysbiosis. Front Reprod Health. 2022;4 :876729. doi: 10.3389/frph.2022.876729. PubMed PMID:36303633 PubMed Central PMC9580658.
  9. Ronzoni, S, Boucoiran, I, Yudin, MH, Coolen, J, Pylypjuk, C, Melamed, N et al.. [Directive clinique no 430 : Diagnostic et prise en charge de la rupture prématurée des membranes avant terme]. J Obstet Gynaecol Can. 2022;44 (11):1209-1225.e1. doi: 10.1016/j.jogc.2022.08.015. PubMed PMID:36202728 .
  10. Chambers, C, Gillis, J, Lindsay, J, Benoit, AC, Kendall, CE, Kroch, A et al.. Low human papillomavirus vaccine uptake among women engaged in HIV care in Ontario, Canada. Prev Med. 2022;164 :107246. doi: 10.1016/j.ypmed.2022.107246. PubMed PMID:36075492 .
Search PubMed

Affiliations & Other Activities

  • Staff Physician, Department of Obstetrics and Gynecology, St. Michael’s Hospital
  • Professor, Department of Obstetrics and Gynecology, University of Toronto
  • Director of Clinical Research, Department of Obstetrics and Gynecology, University of Toronto