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Title
Assessing secondary attack rates among household contacts at the beginning of the influenza A (H1N1) pandemic in Ontario, Canada, April-June 2009: a prospective, observational study.
Authors
Savage R; Whelan M; Johnson I; Rea E; LaFreniere M; Rosella LC; Lam F; Badiani T; Winter AL; Carr DJ; Frenette C; Horn M; Dooling K; Varia M; Holt AM; Sunil V; Grift C; Paget E; King M; Barbaro J; Crowcroft NS