PROVIDENCE — State officials on Friday urged continued precautions after the latest round of surveillance detected one sample of mosquitoes with the Eastern Equine Encephalitis virus in Richmond. The departments of Health and Environmental Management reported that the sample was the only one among 114 pools of mosquitoes trapped on Sept. 24 and 26 that tested positive. 


DEM said that the season's first front advisory, for Friday night, could be welcome news. A hard frost, defined as three straight hours below 32 degrees, kills adult mosquitoes. Its timing varies widely across Rhode Island, from early October in the north to later in the month for southern, ocean-facing areas. It also noted that while fewer fewer mosquitoes are active as evening temperatures get cooler, those mosquitoes that are still active are more likely to be infected with EEE.


The Richmond sample was of mosquitoes that primarily bite birds. In Connecticut, the Ledge Light Health District also announced Friday that mosquitoes trapped in Waterford and Groton had tested positive for EEE, and that the mosquitoes were of a species that is primarily bird-biting. Previously, EEE infected mosquitoes were trapped in North Stonington, Stonington and other towns in southeastern Connecticut.


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