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Halperin S. N Engl J Med 2007;356:110-113
Photomicrograph of Bordetella pertussis
Hygiène hospitalière CHR CITADELLE

Hewlett E and Edwards K. N Engl J Med 2005;352:1215-1222
Annual Reported Cases of Pertussis in the United States from 1922 through 2003
CDC USA

Halperin S. N Engl J Med 2007;356:110-113
Number of Cases of Pertussis Reported in Different Age Groups in Canada in 1989, 1992, 1996,
2000, and 2004
CANADA