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• W2169209946 abstract "Background WHO has recommended vitamin A supplementation for children aged 6 months or older in developing countries at the same time as immunisation. One study has reported significantly lower seroconversion ratios among children who have received vitamin A supplements with measles vaccine at age 6 months. The aim of our study was to assess the effect of vitamin A supplementation on antibody response to measles vaccination at age 9 months, which is the more common age for immunisation in developing countries. Methods In an urban community in Guinea-Bissau, we did a randomised, double-blind, placebo-controlled study of the effect of simultaneous vaccination and vitamin A supplementation in 462 children who received either a two-dose schedule of measles vaccine at the ages of 6 months and 9 months (150 infants) or one dose of measles vaccine at age 9 months (312 infants). Children were followed up to the age of 18 months and a blood sample was then collected to assess the antibody response. Findings 397 (86%) of the children took part in the follow-up (52 [11%] had moved and 13 [3%] had died). Among children who received a two-dose vaccine schedule, seroconversion was 98%. There was no difference in seroconversion or geometric mean titre (GMT) for children receiving vitamin A compared with children receiving no supplement. Among children receiving only one dose of measles vaccine at age 9 months, seroconversion was 95%. The GMT was significantly higher in children receiving vitamin A than in those receiving no supplement (3704 vs 2439 mlU; GMT ratio 1·52 [1·22–1·88]). The effect on plasma antibody concentration in the blood was stronger for boys (3902 vs 1916 mlU; GMT ratio 2·04 [1·53–2·72]) than for girls (3502 vs 3017 mlU; GMT ratio 1·16 [0·85–1·58]) who had received vitamin A with measles vaccine. In a multivariate analysis of variance adjusted for sex, vitamin A supplementation was associated with higher antibody titres (p<0·001). There was a significant interaction between vitamin A supplementation and sex (p=0·02). Interpretation There is no indication that simultaneous administration of measles vaccine and vitamin A supplements has a negative effect on measles immunity. Among the children who had received two doses of measles vaccine at the ages of 6 months and 9 months, supplements of vilamin A had no significant effect. Among children only receiving one dose of measles vaccine at age 9 months, 100000 IU vitamin A increased antibody concentrations, especially for boys." @default.
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• W2169209946 date "1997-07-01" @default.
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• W2169209946 title "Randomised trial of effect of vitamin A supplementation on antibody response to measles vaccine in Guinea-Bissau, west Africa" @default.
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• W2169209946 doi "https://doi.org/10.1016/s0140-6736(96)12019-5" @default.
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