Influenza vaccine effectiveness against influenza-related hospitalization during a season with mixed outbreaks of four influenza viruses: a test-negative case-control study in adul... oleh Melissa K. Andrew, Vivek Shinde, Todd Hatchette, Ardith Ambrose, Guy Boivin, William Bowie, Ayman Chit, Gael Dos Santos, May ElSherif, Karen Green, François Haguinet, Scott A. Halperin, Barbara Ibarguchi, Jennie Johnstone, Kevin Katz, Joanne M. Langley, Jason LeBlanc, Mark Loeb, Donna MacKinnon-Cameron, Anne McCarthy, Janet McElhaney, Allison McGeer, Michaela K. Nichols, Jeff Powis, David Richardson, Makeda Semret, Grant Stiver, Sylvie Trottier, Louis Valiquette, Duncan Webster, Lingyun Ye, Shelly A. McNeil, on behalf of the Public Health Agency of Canada/Canadian Institutes of Health Research Influenza Research Network (PCIRN) Serious Outcomes Surveillance Network and the Toronto Invasive Bacterial Diseases Network (TIBDN)