The seasonal variation in respiratory syncytial virus (RSV) infections in children was examined in Benin City. Nasopharyngeal washes were obtained from children under 3 years hospitalised for acute lower respiratory infections during two seasons - rainy season (June-August) and dry season (December-February). RSV surface antigen was identified by ELISA. 54% of patients in the rainy season were ELISA positive for RSV compared to 8.8% during the dry season. Clinical features in the RSV infected patients were not different between the two seasons and were similar to that reported from temperate climates. It is concluded that RSV infections occur all year round with a peak during the rainy season.
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