Duration of post-vaccination immunity to yellow fever in volunteers eight years after a dose-response study.

Autor: de Menezes Martins R; Bio-Manguinhos/Fiocruz, Brazil. Electronic address: rmenezes@bio.fiocruz.br., Maia MLS; Bio-Manguinhos/Fiocruz, Brazil., de Lima SMB; Bio-Manguinhos/Fiocruz, Brazil., de Noronha TG; Bio-Manguinhos/Fiocruz, Brazil., Xavier JR; Bio-Manguinhos/Fiocruz, Brazil., Camacho LAB; National School of Public Health, Fiocruz, Brazil., de Albuquerque EM; Bio-Manguinhos/Fiocruz, Brazil., Farias RHG; Brazilian Army Health Service, Brazil., da Matta de Castro T; Bio-Manguinhos/Fiocruz, Brazil., Homma A; Bio-Manguinhos/Fiocruz, Brazil.
Jazyk: angličtina
Zdroj: Vaccine [Vaccine] 2018 Jun 27; Vol. 36 (28), pp. 4112-4117. Date of Electronic Publication: 2018 May 18.
DOI: 10.1016/j.vaccine.2018.05.041
Abstrakt: In 2009, Bio-Manguinhos conducted a dose-response study with the yellow fever vaccine, administering the vaccine in the usual mean dose of 27,476 IU (full dose, reference) and in tapered doses (10,447 IU, 3013 IU, 587 IU, 158 IU, and 31 IU) by the usual subcutaneous route and usual volume (0.5 mL). Tapered doses were obtained by dilution in the manufacturer's laboratory, and the test batches presented industrial quality. Doses down to 587 IU showed similar immunogenicity to the full dose (27,476, reference), while the 158 IU and 31 IU doses displayed lower immunogenicity. Seropositivity was maintained at 10 months, except in the group that received the 31 IU dose. The current study aims to determine whether yellow fever seropositivity was maintained eight years after YF vaccination in non-revaccinated individuals. According to the current study's results, seropositivity was maintained in 85% of 318 participants and was similar across groups. The findings support the use of the yellow fever vaccine in fractional doses during outbreaks, but each fractional dose should have at least 587 IU. This study also supports the minimum dose required by WHO, 1000 IU.
Clinical Trials Registration: Clinicaltrials.gov NCT 03338231.
(Copyright © 2018 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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