A randomized, double-blind trial of pneumococcal vaccination in adult allogeneic stem cell transplant donors and recipients

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
D KumarA Humar

Abstract

Adult allogeneic hematopoietic stem cell transplant (HSCT) recipients are at high risk of invasive pneumococcal disease but have suboptimal responses to the recommended pneumococcal polysaccharide vaccine (PPV23). Pneumococcal conjugate vaccine (PCV7) may improve immunogenicity in this population, and a donor vaccination strategy may benefit patients undergoing HSCT. Sixty-four pairs of donors and recipients scheduled to undergo HSCT were randomized to receive either PPV23 or PCV7. Vaccinations were administered to donors before transplantation and to recipients at 6 months after transplantation. Serotype-specific antipneumococcal titers were measured in donors at the time of harvest and in recipients before transplantation and 6 and 12 months after transplantation. Overall, immunogenicity was poor with both strategies. However, at 6 months, response to at least 1 serotype was seen in 0 (0%) of 19 and 8 (38.6%) of 21 evaluable recipients whose donors had received PPV23 and PCV7, respectively (P=.003). At 12 months, response was seen in 10 (55.6%) of 18 and 20 (90.9%) of 22 HSCT recipients who had received PPV23 and PCV7, respectively (P=.02). Multivariate logistic regression revealed that, at 12 months after transplantation, th...Continue Reading

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