Age distribution of respiratory syncytial virus disease in children younger than 5 years in low-income and middle-income countries: a systematic review and meta-analysis

The Lancet Child & Adolescent Health • April 01, 2026

Severe RSV hits youngest infants earliest

In low- and middle-income countries, the most severe respiratory syncytial virus illness clusters in the first weeks of life. *Systematic review and meta-analysis of observational studies; Level 1a (OCEBM).

Level of evidence: Level 1a (OCEBM)

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