17DD Yellow Fever Revaccination and Heightened Long-Term Immunity in Populations of Disease-Endemic Areas, Brazil.
Emerg Infect Dis
; 25(8): 1511-1521, 2019 08.
Article
em En
| MEDLINE
| ID: mdl-31298654
ABSTRACT
We evaluated the duration of neutralizing antibodies and the status of 17DD vaccine-specific T- and B-cell memory following primary and revaccination regimens for yellow fever (YF) in Brazil. We observed progressive decline of plaque-reduction neutralization test (PRNT) seropositivity and of the levels of effector memory CD4+ and CD8+ T cells, as well as interferon-γ+CD8+ T cells, 10 years after primary vaccination. Revaccination restored PRNT seropositivity as well as the levels of effector memory CD4+, CD8+, and interferon-γ+CD8+ T cells. Moreover, secondary or multiple vaccinations guarantee long-term persistence of PRNT positivity and cell-mediated memory 10 years after booster vaccination. These findings support the relevance of booster doses to heighten the 17DD-YF-specific immune response to guarantee the long-term persistence of memory components. Secondary or multiple vaccinations improved the correlates of protection triggered by 17DD-YF primary vaccination, indicating that booster regimens are needed to achieve efficient immunity in areas with high risk for virus transmission.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Febre Amarela
/
Vírus da Febre Amarela
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Imunização Secundária
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Vacina contra Febre Amarela
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Imunidade
Limite:
Adolescent
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Adult
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Aged
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Female
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Humans
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Male
/
Middle aged
País/Região como assunto:
America do sul
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Brasil
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article