Immune responses to oral poliovirus vaccine in HIV-exposed uninfected Zimbabwean infants
Human Vaccines and Immunotherapeutics
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It remains uncertain whether HIV-exposed uninfected (HEU) infants have impaired responses to oral vaccines. We carried out a cross-sectional study of 6-month-old infants recruited at birth to the ZVITAMBO trial in Zimbabwe between 1997-2001, prior to introduction of prevention of mother-to-child transmission interventions. We measured poliovirus-specific IgA to type 1-3 polio strains by semi-quantitative capture ELISA in cryopreserved serum samples collected from 85 HEU and 101 HIV-unexposed infants at 6 months of age, one month after their last immunisation with trivalent OPV. Almost all infants were breastfed, with the majority in both groups mixed breastfed (70.6% HEU versus 71.3% HIV-unexposed). Median (IQR) vaccine titres for HEU and HIV-unexposed infants were 1592 (618-4896) versus 1774 (711-5431) for Sabin 1 (P=0.46); 1895 (810-4398) versus 2308 (1081-4283) for Sabin 2 (P=0.52); and 1798 (774-4192) versus 2260 (996-5723) for Sabin 3 (P=0.18). There were no significant differences in vaccine titres between HEU and HIV-unexposed infants, suggesting that vertical HIV exposure does not impact oral poliovirus vaccine immunogenicity.
AuthorsCHURCH, JA; Prendergast, A
- Genomic Medicine