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Free Content Desiccated vector mosquitoes used for the surveillance of Japanese encephalitis virus activity in endemic southern India

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Abstract:

Summary To monitor Japanese encephalitis virus (JEV) activity in endemic areas of Tamil Nadu, southern India, desiccated vector mosquitoes were screened for JEV antigen using ELISA, from 1996. A total of 133 233 specimens from eight index villages comprising 2816 pools (mainly subgroup) were tested. Of these, 59 pools (2.1%) were positive for JEV antigen. Control measures were undertaken in positive villages accordingly. The average annual minimum infection rate was 0.8 at the beginning of the study and remained lower for nearly 8 years. A declining trend in JE cases was recorded.

French
Afin de surveiller l’activité du virus de l’encéphalite japonaise (VEJ) dans les zones endémiques du Tamil Nadu, dans le sud de l’Inde, des moustiques vecteurs asséchés ont été analysés par ELISA pour la détection de l’antigène de VEJ à partir de 1996. Un total de 133 233 spécimens provenant de 8 villages indices, rassemblant 2 816 pools (principalement le sous-groupe Culex vishnui) ont été testés. Parmi ceux-ci, 59 pools (2,1%) étaient positifs pour l’antigène de VEJ. Par conséquent des mesures de contrôle ont été prises dans les villages positifs. La moyenne annuelle du taux minimum d’infection était de 0,8 au début de l’étude et est restée inférieure sur près de 8 ans. Une tendance à la baisse des cas d’encéphalite japonaise a été enregistrée.
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