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Volume 32, Number 10—October 2026

Research

Wastewater Surveillance to Track Resurgent Measles Outbreak, Ontario, Canada, 2025

Ryland Corchis-ScottComments to Author , Élisabeth Mercier, Edgard M. Mejia, Qiudi Geng, Ethan Harrop, Ana Podadera, Jackie Fong, Natalie Lewoc, Kenneth K.S. Ng, Nataliya Santiago, Natalie Knox, Lawrence Goodridge, Chand S. Mangat, Chrystal Landgraff, Karen B. Riddell, Mehdi Aloosh, Robert Delatolla, and R. Michael McKay
Author affiliation: University of Windsor, Windsor, Ontario, Canada (R. Corchis-Scott, Q. Geng, E. Harrop, A. Podadera, J. Fong, K.K.S. Ng, R.M. McKay); University of Ottawa, Ottawa, Ontario, Canada (É. Mercier, R. Delatolla); National Microbiology Laboratory, Winnipeg, Manitoba, Canada (E.M. Mejia, N. Santiago, N. Knox, C.S. Mangat, C. Landgraff); Windsor Essex County Health Unit, Windsor (N. Lewoc, M. Aloosh); University of Guelph, Guelph, Ontario, Canada (L. Goodridge); Windsor Regional Hospital, Windsor (K.B. Riddell); McMaster University, Hamilton, Ontario, Canada (M. Aloosh)

Main Article

Table

Daily measles virus shedding estimates based on samples collected from hospital effluent in Windsor, Ontario, Canada, March–May 2025*

Date No. patients hospitalized Shedding estimate, gc/d/person, +SD
Mar 25 2 1.53 × 1012 +2.64 × 1011
Mar 26 2 6.60 × 1012 +4.13 × 1011
Apr 8 1 3.73 × 108 +1.47 × 108
Apr 9 1 3.32 × 108 +1.59 × 108
Apr 22 2 7.61 × 108 +7.02 × 108
May 6 1 4.17 × 1011 +9.73 × 1010

*gc, gene copies.

Main Article

Page created: July 01, 2026
Page updated: September 28, 2026
Page reviewed: September 28, 2026
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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