Additional Study Information: We are seeking volunteers who have been recently diagnosed with influenza virus infection by either rapid diagnostic assay or RT-PCR in the last 5 days, and live in a household with at least one other person. The study, also known as RVTN Flu will be looking at household transmission of influenza. Once someone and their household contacts are enrolled, they will be followed for 7 consecutive days to identify new virus infections among household members. Follow-up will include interviews/questionnaires, daily data collection from all participating household members for 7 days, daily self-collected nasal swabs from all participating household members, remote video/telephone visits during the follow-up period, and a survey 4 weeks after enrollment. All study visits will be remote ie no one has to come to the medical center. Households will be compensated up to $250.