Serotype-specific Immunity and Association With Pneumococcal Carriage Following 3+1, 3+0, and 2+1 Schedules of 10-valent Pneumococcal Conjugate Vaccine.
Darren Suryawijaya Ong, Zheng Quan Toh, Beth Temple et al.
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In 30 seconds
This phase II/III randomized controlled trial in Vietnam evaluated the relationship between serotype-specific memory B cells, IgG, and opsonophagocytic responses following different schedules of the 10-valent pneumococcal conjugate vaccine (PCV10) in infants. The study found that only IgG levels were negatively associated with serotype 19A carriage, with an odds ratio of 0.31 for carriage defined as ≥2-fold seroincidence.
Key findings
- At 10 months, IgG and OPA were higher in the 3 + 1/2 + 1 arms compared to the 3 + 0 arm.
- At 18 months, Bmem and IgG waned for most serotypes across all vaccine arms.
- IgG was negatively associated with serotype 19A carriage (odds ratio: 0.31, P = .038).
- IgG was also negatively associated with any increase in carriage (odds ratio: 0.13, P < .001).
Why it matters
Understanding the immunological correlates of pneumococcal carriage is crucial for developing effective vaccination strategies. This study highlights the limited association between common immunological responses and carriage, suggesting the need for further research to clarify these relationships.