Rates of Acute Respiratory Illness by age group from household and clinic surveillance in Asembo, western Kenya (Lwak Hospital) and Kibera, Nairobi (Tabitha Clinic), June 1, 2006 – May 31, 2008.

<p>*Adjusted clinic rates were calculated by extrapolating from those with same syndrome defined at household visit who sought care at a clinic besides the designated referral clinics, Lwak and Tabitha (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0016085#s2" target="_blank">methods</a>). In Asembo, in the age categories <1 year, 12–23 months, 24–59 months, <5 years, 5–17 years, 18–34 years, 35–49 years, ≥50 years and ≥5 years, the percentage of all clinic visits for ARI to Lwak were 44%, 47%, 49%, 47%, 50%, 46%, 45%, 43%, and 47%, respectively. For Kibera, for the same age groups, the percentages of all clinic visits for ARI to Tabitha were 42%, 46%, 38%, 41%, 30%, 29%, 29%, 27% and 29%, respectively.</p><p>Longitudinal prevalence is days of cough or difficulty breathing as part of an ARI episode per person-year. Incidence is number of episodes of ARI per person-year.