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Mosquito Response Protocol
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RI Department of Environmental Management
235 Promenade Street, Providence, RI 02908
(401) 222-2771 TDD/(401) 222-4462
DEM: OCTOBER 10 WEST NILE/EEE STATUS UPDATEPROVIDENCE -- The Department of Environmental Management announces that test results from the remaining 83 mosquito pools, or samples, from 44 traps set statewide during the week of September 24 are negative for both West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE). DEM previously announced that one mosquito pool from a trap set in northern Tiverton on September 24 was confirmed positive for EEE.
According to Alan Gettman, Ph.D., DEM's mosquito abatement coordinator, even though evening temperatures have gotten cooler, there are still infected mosquitoes in the environment. Therefore, all Rhode Islanders should take extra care to protect themselves, particularly when mosquito-biting activity is high. Biting activity depends on several conditions. It generally is greatest from dusk to dawn. During the day it decreases in sunny areas at lower temperatures and increases in shady areas at higher temperatures. Biting activity also generally increases with high humidity and with low wind.
Personal protection is the first line of defense against mosquitoes that can carry diseases such as West Nile Virus and EEE and is by far the most effective way of avoiding infection. People should routinely use mosquito repellent and cover up when mosquito-biting activity is greatest. They should place mosquito netting over playpens and carriages outside, and be sure that screens are in good repair. Mosquito repellent should contain no more than 30 percent DEET, and it should not be used on infants.
Because horses are susceptible to West Nile Virus and EEE, Rhode Island horse owners should consult with their veterinarians to determine if their horses are properly vaccinated against both diseases and take measures to control and prevent mosquito exposure. Those controls should include: removing or covering all areas where standing water can collect; applying mosquito larvicide in appropriate locations; and avoiding turning animals outside at dawn, dusk and during the night when mosquitoes are most active. Horse owners should insect-proof facilities where possible; use approved repellants frequently; monitor animals for symptoms of fever, in-coordination, stumbling and neurological signs; and report all suspicious cases to a veterinarian immediately.
This year, to date in Rhode Island, six pools of mosquitoes have tested positive for Eastern Equine Encephalitis and five pools have tested positive for West Nile Virus.
Mosquitoes in Rhode Island are trapped every week statewide by DEM staff and tested at the RI Department of Health laboratory. DEM will normally report mosquito test results once a week on a routine basis, with additional reports as necessary.
For online information about mosquito-borne diseases, go to DEM's website, www.state.dem.ri.gov, and click on "Public Health Updates", or go to the HEALTH website, www.health.ri.gov, and click on "E" (Eastern Equine Encephalitis) or "W" (West Nile Virus) under "Health Topics".