Incidence rates of ARI for all persons ≥5 years of age, and among HIV-positive and HIV-negative persons ≥18 years from Lwak Hospital, western Kenya. March 1, 2007,-February 28, 2010.

Incidence is given as episodes per 100 person-years of observation (pyo).aHIV status was known for 69% of the surveillance population ≥18 years old. Only those with known HIV status were included in the numerators and denominators for rate calculations by HIV status. For persons 5–12 years of age, HIV testing was not routinely done as part of home-based counseling and testing and therefore rates for 5–17 year olds is not included in rate calculations (see methods).bAdjusted clinic rates were calculated by extrapolating from persons with ARI defined at household visit who sought care at another clinic besides the designated referral clinic, Lwak Hospital (see methods). In the age categories 5–17 years, 18–34 years, 35–49 years, ≥50 years, ≥5 years and ≥18 years, the percentage of ARI patients who sought care at another clinic besides Lwak were 41%, 43%, 43%, 48%, 53%, 43%, and 46% respectively. Health-seeking at Lwak was similar among HIV-positive and HIV-negative persons, so the same adjustment percentages were used.