Vaccine effectiveness of PCV13 in a 3+1 vaccination schedule.

ABSTRACT

OBJECTIVE: To assess the vaccine effectiveness (VE) of PCV13 for invasive pneumococcal disease (IPD) regarding the extra six serotypes with a 3+1 schedule in Germany. METHODS: Active surveillance for IPD in children <16 years eligible for PCV13 vaccination. We used the Broome method and logistic regression to estimate VE. RESULTS: Data on 164/304 reported IPD cases were informative and met the inclusion criteria. VE for the extra six serotypes was 88% [95% confidence interval (CI) 73; 95] and 83% [56; 94] for at least one and for at least two doses respectively. VE for the complete 3+1 vaccination schedule was not conclusive because of a wide 95% CI. For serotype 3 VE appeared to be zero with an even wider 95% CI. CONCLUSION: PCV13 VE against the extra six serotypes with the 3+1 schedule in Germany was only marginally higher compared to previously published data for the 2+1 schedule.