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This study found a higher risk of intussusception (IS) in infants aged 3-5 months within 7 days of their first Rotavirus (RV) vaccine dose. Delaying the first RV vaccine dose until 6-12 weeks of age is recommended.

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Area of Science:

  • Pharmacoepidemiology
  • Vaccinology
  • Pediatric Gastroenterology

Background:

  • Recent studies link Rotavirus (RV) vaccines to intussusception (IS).
  • The incidence of IS in Germany before RV vaccine market authorization in 2006 is established.
  • Understanding the temporal relationship between RV vaccination and IS is crucial for public health.

Purpose of the Study:

  • To investigate excess intussusception (IS) cases in Rotavirus (RV) vaccine recipients in Germany compared to pre-authorization incidence.
  • To determine if specific age groups or vaccination timings are associated with an increased risk of IS following RV vaccination.
  • To provide evidence-based recommendations for optimal RV vaccine administration schedules.

Main Methods:

  • Pharmacoepidemiological analysis of suspected IS cases reported to the Paul-Ehrlich-Institut (PEI) between 2006 and 2010.
  • Validation of IS cases using the Brighton Collaboration's definition.
  • Observed-versus-expected analysis using standardized morbidity ratios (SMR) based on age-specific IS incidence rates.

Main Results:

  • A total of 27 suspected IS cases in RV vaccinees were reviewed.
  • No excess IS cases were detected 1-7 days after any RV vaccine dose in the first year of life.
  • A significantly increased SMR for IS was observed in infants aged 3-5 months within 1-7 days after the first RV vaccine dose (Rotarix® SMR 4.6; RotaTeq® SMR 5.8).

Conclusions:

  • A significantly increased risk of IS exists in a 1-7 day window after the first RV vaccine dose, particularly in 3-5 month old infants.
  • This increased risk was not observed when the first RV vaccine dose was administered earlier than 3 months.
  • It is recommended to initiate the Rotavirus vaccination course between 6 and 12 weeks of age to minimize IS risk.