Fig. 2From: Seroprevalence of influenza A virus in pigs and low risk of acute respiratory illness among pig workers in KenyaSchema of households’ and participants’ enrolment, follow-up, and lost to follow-up. Participants from pig-keeping and non-pig-keeping households were enrolled and had a follow-up visit after 12 or 14 weeks. *Only households where no participant was available during the follow-up were includedBack to article page