Household Transmission of the 2009 Pandemic A/H1N1 Influenza Virus: Elevated Laboratory‐Confirmed Secondary Attack Rates and Evidence of Asymptomatic Infections

Abstract

Household transmission of pH1N1 may be substantially greater than previously estimated, especially in association with clinical presentations that include gastrointestinal complaints. Approximately 10% of pH1N1 infections acquired in the household may be asymptomatic.