This study is being conducted to assess impact of maternal immunisation against pertussis in infants ≤12 months of age before and after introduction of pertussis maternal immunisation in Bogota, Colombia from January 2005-December 2014.
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Occurrence of reported cases of hospitalisations and deaths due to pertussis in infants ≤6 weeks of age, in post-vaccination period compared to pre-vaccination period of Boostrix vaccination
Timeframe: During the 9-year period (January 2005- December 2014)