Nitatpattana N., Kanjanopas K., Yoksan S., Satimai W., Vongba N., Langdatsuwan S., Nakgoi K., Ratchakum S., Wauquier N., Souris Marc, Auewarakul P., Gonzalez Jean-Paul. (2014). Long-term persistence of Chikungunya virus neutralizing antibodies in human populations of North Eastern Thailand. Virology Journal, 11, art. 183 [5 p.]. ISSN 1743-422X.
Titre du document
Long-term persistence of Chikungunya virus neutralizing antibodies in human populations of North Eastern Thailand
Année de publication
2014
Auteurs
Nitatpattana N., Kanjanopas K., Yoksan S., Satimai W., Vongba N., Langdatsuwan S., Nakgoi K., Ratchakum S., Wauquier N., Souris Marc, Auewarakul P., Gonzalez Jean-Paul
Source
Virology Journal, 2014,
11, art. 183 [5 p.] ISSN 1743-422X
Background: Chikungunya virus (CHIKV) outbreak recurrences in Thailand are unpredictable and separated by unexplained and often long silent epidemiological periods that can last for several years. These silent periods could be explained in part by the fact that infection with one CHIKV strain confers lasting natural immunity, even against other CHIKV strains. In this study we evaluated the persistence of CHIKV-specific neutralizing antibodies in the population of Chumpae District, Khon Kaen Province, nineteen years after a CHIKV outbreak occurred in the same area in 1991. Findings: Overall 39% (44/111) of 111 former patients had neutralizing antibodies reacting against CHIKV ECSA strain. Consistently high titers of neutralizing antibodies were found in 75% (33/44) of all positively-reacting sera, 70% of which (23/33) were collected from individuals amongst the >60 years old age group. Although the prevalence found in Pong Haeng village (70%) was significantly higher than the prevalence detected in the Nong Thum village (14%), control study villages without known previous Chikungunya epidemics had a high Chikungunya neutralizing antibody prevalence (65%). Conclusions: More than one-third of the pre-exposed population had persisting natural immunity that was more likely boosted by recent and repetitive exposure to the emerging ECSA CHIKV in Thailand. Also, Chikungunya virus appears to largely circulate in the country with a great variability appears between villages or area probably associated with the vector abundance and efficiency. Altogether these results show a potential for a lifelong immunity against CHIKV. Given the rapid spread of the highly pathogenic ECSA strain in Southern Thailand, the development of CHIK vaccine is strongly recommended.
Plan de classement
Santé : généralités [050]
;
Entomologie médicale / Parasitologie / Virologie [052]
Description Géographique
THAILANDE
Localisation
Fonds IRD [F B010062639]
Identifiant IRD
fdi:010062639
