Table 1. WHO surveillance case definitions evaluated.

Case definition	Criteria
WHO before 2011	Any child aged 2 months to 5 years with cough or difficulty in breathing and unable to drink or breastfeed, or vomits everything, or convulsions, or lethargic or unconscious, or chest indrawing or stridor in a calm child and requires hospital admission [13].
WHO 2014 (official)	An acute respiratory infection with history of fever or measured fever of ≥ 38°C and cough; with onset within the last ten days and requires hospitalization [14].
WHO 2014 (with fever of ≥ 38°C and cough only)	An acute respiratory infection with measured fever of ≥ 38°C and cough; with onset within the last ten days and requires hospitalization.