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 stud... oleh Horn Maureen, Frenette Crystal, Carr Deborah J, Winter Anne-Luise, Badiani Tina, Lam Freda, Rosella Laura C, LaFreniere Marie, Rea Elizabeth, Johnson Ian, Whelan Michael, Savage Rachel, Dooling Kathleen, Varia Monali, Holt Anne-Marie, Sunil Vidya, Grift Catherine, Paget Eleanor, King Michael, Barbaro John, Crowcroft Natasha S