Study area
This study was conducted in Nakuru, Elgeyo Marakwet and Nandi Counties in the Rift Valley region. The sites in which the study was implemented include three district hospitals and one sub-district hospital (Figure 1). The sentinel sites were selected purposively due to the paucity of information regarding respiratory infections in these counties and their contributions to the healthcare burden in Kenya. A temperate climate characterizes the study location with an altitude ranging between 2000-2500m above sea level.