Published online ahead of print July 20, 2009
CMAJ 10.1503/cmaj.090859
© 2009 Canadian Medical Association or its licensors
All editorial matter in CMAJ represents the opinions of the authors and not necessarily those of the Canadian Medical Association.
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Original Article

Investigation of the first cases of human-to-human infection with the new swine-origin influenza A (H1N1) virus in Canada

Jennifer Cutler 1, Emily Schleihauf 2, Todd F Hatchette 3, Bev Billard 4, Gaynor Watson-Creed 5, Ross Davidson 6, Yan Li 7, Nathalie Bastien 7, Shelly Sarwal 8, Nova Scotia Human Swine Influenza Investigation Team

1 Canadian Field Epidemiology Program, Public Health Agency of Canada, Ottawa, Ont.; the Nova Scotia Department of Health Promotion and Protection, Halifax, NS
2 Canadian Public Health Service, Public Health Agency of Canada, Ottawa, Ont.; the Nova Scotia Department of Health Promotion and Protection, Halifax, NS
3 Division of Microbiology, Department of Pathology and Laboratory Medicine, Capital District Health Authority, Halifax, NS; and the Departments of Pathology, Dalhousie University, Halifax, NS
4 the Nova Scotia Department of Health Promotion and Protection, Halifax, NS
5 the Nova Scotia Department of Health Promotion and Protection, Halifax, NS; the Department of Community Health and Epidemiology, Dalhousie University, Halifax, NS
6 Division of Microbiology, Department of Pathology and Laboratory Medicine, Capital District Health Authority, Halifax, NS; and the Departments of Pathology, Microbiology and Immunology, Dalhousie University, Halifax, NS
7 National Microbiology Laboratory, Public Health Agency of Canada, Ottawa, Ont.
8 Nova Scotia Department of Health Promotion and Protection, Halifax, NS; the Department of Community Health and Epidemiology, Dalhousie University, Halifax, NS


*   Abstract
The outbreak of human infection due to the novel swine-origin influenza A (H1N1) virus began in Mexico in March 2009. As of July 6, 2009, more than 94 000 laboratory-confirmed cases were reported in over 100 countries, in cluding 7983 cases in Canada. In this report, we describe the epidemiologic and clinical characteristics of the first cluster of reported cases of human-to-human transmission of the new influenza virus in Canada.


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