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The vehicle for virus transmission is droplets from a person’s respiratory tract. One may come into direct contact, coughing/sneezing, or by hands contaminated with respiratory secretions (hence, the importance of washing hands regularly). There is an initial incubation period of 3 days then flu symptoms appear and the virus are communicable for 7 days. Children may transmit infection for longer than 7 days. If 10 (3+7) days have elapsed and no new cases of flu in your household, school, work place, or institution, one may consider outbreak to have passed.