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Antibody responses in humans to an inactivated hantavirus vaccine (Hantavax).
Vaccine 1999 June 5
Hantaviruses cause haemorrhagic fever with renal syndrome (HFRS) and result in severe human morbidity and mortality. Safe and effective vaccines are needed urgently in order to reduce the incidence of human illness. Hitherto studies of hantavirus vaccine efficiency have been limited to individuals at low risk of infection. In this study the immune response to an inactivated hantavirus vaccine was measured in 64 human volunteers at high risk of infection by virtue of residence and occupation. 30 d after vaccination, 79% of subjects developed a significant hantavirus antibody titre as measured by immunofluorescence (IFA) and 62% by enzyme linked immunosorbent assay (ELISA). Seroconversion rates increased to 97% one month after the booster dose. Neutralising antibody titres paralleled this trend with 13% of vaccine recipients producing neutralising antibody one month after the first dose and 75% of vaccine recipients responding one month after boosting. Antibody titres had declined by one year, however, with only 37% and 43% of sera positive by IFA and ELISA, respectively. Re-vaccination at this time produced a vigorous anamnestic response with 94% and 100% of vaccine recipients yielding positive antibody titres. Only 50% of the sampled population, however, produced neutralising antibodies following the booster dose one year later. The vaccine was well tolerated and there were no apparent differences in the responses of males and females. However, further improvement of this vaccine is necessary in order to induce a more longlasting humoral immune response.
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