Effects of attenuated influenza virus administration to young children on pneumococcal density and acquisition in UK families: a randomised controlled trial.
Lancet MicrobeAug 18, 2026 (epub)
Jane Metz, George Qian, Begonia Morales-Aza et al.
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In 30 seconds
This randomized controlled trial investigated the effects of live attenuated influenza vaccine (LAIV) on pneumococcal density and acquisition in young children and their household contacts in the UK. The study found a 2.5-times increase in the odds of vaccinated children having increased pneumococcal density 14 days post-vaccination compared to unvaccinated children.
Key findings
- Vaccinated children had a 2.5-times increase in pneumococcal density at 14 days compared to unvaccinated children.
- There was a 2.0-times increase in the odds of S pneumoniae acquisition among household contacts of vaccinated children.
- Effects on pneumococcal density appeared to attenuate by day 28.
Why it matters
Understanding the impact of LAIV on pneumococcal carriage can inform vaccination strategies and public health policies, particularly regarding indirect effects on community health and potential implications for antibiotic resistance.