Klebsiella-dominant gut communities are associated with impeded oral rotavirus vaccine response in infants.

Infants with Klebsiella-dominant gut communities in the first month show reduced rotavirus vaccine seroconversion and shedding across diverse populations.

• Why it matters: Understanding factors that impair vaccine efficacy is crucial for improving infant health, especially in low-income settings where vaccine response varies and rotavirus causes significant mortality.
• What they did: The study analyzed gut microbiome composition, inflammation markers, and vaccine response in infants from Panama, Peru, and the U.S., focusing on the first month of life and the abundance of Klebsiella.
• The result: Elevated Klebsiella or Escherichia in early gut communities was linked to decreased vaccine seroconversion and rotavirus shedding, suggesting microbiome-related inflammation may hinder vaccine effectiveness.