4.5 Article

Immune response after rabies pre-exposure prophylaxis and a booster dose in Australian bat carers

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ZOONOSES AND PUBLIC HEALTH
卷 70, 期 6, 页码 465-472

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WILEY
DOI: 10.1111/zph.13048

关键词

antibodies; immunization schedule; immunization; pre-exposure prophylaxis; rabies vaccines; secondary

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Periodic vaccination against rabies is crucial for those with ongoing risk of exposure. This study examined the long-term immunity after a 3-dose intramuscular (3IM) pre-exposure prophylaxis and single IM booster dose in Australian bat carers. The findings suggest that a serology test should be conducted 1 year after 3IM PrEP, followed by a booster if necessary. The antibodies against rabies can persist for many years after receiving the booster doses.
Periodic vaccination against rabies is essential for individuals at continuing risk of rabies exposure. There is limited evidence on long-term immunogenicity after a 3-dose intramuscular (3IM) pre-exposure prophylaxis (PrEP) and single IM booster dose, thus current guideline recommendations differ in the interval for serology tests following PrEP and boosters. This study investigated post-PrEP and post-booster persistence of antibodies in Australian bat carers. Bat carers who received 3IM PrEP/booster doses and had post-PrEP/booster serology test results were included. The proportion of antibody-negative (<0.5 EU/mL) individuals after PrEP/booster dose were examined. Three hundred and five participants (65.6% females, median age at PrEP 43.1 years) were included. The proportion who were antibody-negative varied depending on the time between 3IM PrEP and the serology test: 8.0% <1 year, 29.8% 1-2 years, 21.2% 2-3 years and 7.7% >3 years. Ninety-one participants receiving booster doses were further assessed. Only one participant was antibody-negative at >3 years after receiving one IM booster dose. Our findings support that a serology test should be performed 1 year after 3IM PrEP, followed by first booster if required. Rabies antibodies persist for many years after receiving the booster doses. The interval between subsequent serology tests and the first booster dose should be no longer than 3 years. Future studies are required to provide more insight into the most appropriate timing of subsequent boosters.

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