A Culex quinquefasciatus mosquito is shown on a human finger in this undated handout photograph from the Centers for Disease Control and Prevention (CDC). The Culex quinquefasciatus mosquito has been proven to be a vector associated with transmission of the West Nile virus, according to the CDC. More than 400 new U.S. Cases of West Nile virus emerged in the last week, in an outbreak that remains one of the worst on record but has begun to show signs of slowing down. REUTERS/James Gathany/Center For Disease Control/Handout (UNITED STATES - Tags: SCIENCE TECHNOLOGY HEALTH) THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
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