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The problem
Intervention: Population-based nirsevimab immunization administered to newborns and children under 6 months of age
Who it was tested with: Newborns and infants under 6 months of age in a tertiary care hospital catchment area.
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"Cohort study comparing the cumulative incidence of admissions due to RSV and other respiratory viruses in a tertiary care hospital in two consecutive epidemic seasons. The population of the second season underwent a population-based intervention consisting of the administration of nirsevimab to newborns and children under 6 months of age (intervention group), which did not occur in the first season (control group)." This is a quasi-experimental design using historical cohorts to evaluate a real-world immunization intervention with measurable outcomes on hospital admissions.
No country specified in document. Unexpected increases in rhinovirus and metapneumovirus admissions during intervention season cannot establish causality. Seasonal variation and other confounding factors not controlled in cohort comparison. No randomization of intervention.
Across countries and designs
2 studies · 1 country
Not yet reviewed by a person. Model output is not AICS's view until reviewed.
claude-haiku-4-5-20251001 · synth-v1
