West Nile Virus Outbreak in Horses, Southern France, 2000: Results of a Serosurvey
Author(s) -
Bernard Durand,
Véronique Chevalier,
Régis Pouillot,
Jacques Labié,
Ingrid Marendat,
Bernadette Murgue,
H. Zeller,
Stéphan Zientara
Publication year - 2002
Publication title -
emerging infectious diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.54
H-Index - 226
eISSN - 1080-6059
pISSN - 1080-6040
DOI - 10.3201/eid0808.010486
Subject(s) - outbreak , west nile virus , veterinary medicine , virology , antibody , virus , biology , geography , medicine , immunology
During late summer and autumn 2000, a West Nile fever outbreak in southern France resulted in 76 equine clinical cases; 21 horses died. We report the results of a large serosurvey of all equines within a 10-km radius of laboratory-confirmed cases. Blood samples were obtained from 5,107 equines, distributed in groups of 1 to 91 animals. West Nile virus immunoglobulin (Ig) G antibodies were found in 8.5% of animals (n=432). Forty-two percent of the IgG-positive animals were also IgM positive. Horses living in small groups were more affected than those in large groups. The results suggest that West Nile virus is not endemic in the affected area, the Camargue; rather, sporadic outbreaks are separated by long silent periods.
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