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DEM reports West Nile Virus found in Tiverton, Pawtucket

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PROVIDENCE – The Rhode Island Department of Environmental Management (DEM) announces that test results from two mosquito pools, or samples, from traps set in Tiverton and Pawtucket on July 30 have been confirmed positive for West Nile Virus (WNV). These are the first findings of WNV in Rhode Island this year and are not unexpected. Mosquito-borne diseases are more prevalent in late summer and early fall, and risk typically lasts until the first frost.

The positive findings came from mosquitoes trapped by DEM staff and tested at the Rhode Island Department of Health (RIDOH) State Health Laboratories. The remaining 157 mosquito samples from 39 traps set on July 30 have tested negative for WNV and Eastern Equine Encephalitis (EEE).

To date, in Rhode Island, two mosquito samples have tested positive for WNV, and four mosquito samples have tested positive for EEE. Neighboring states of Connecticut and Massachusetts have reported positive findings of WNV in mosquito samples this year.

Personal protection is the first line of defense against mosquitoes that may carry WNV, EEE, or other diseases – and the most effective way to avoid infection. With WNV and EEE established throughout the state, DEM and RIDOH remind the public to eliminate mosquito breeding grounds and prevent being bitten, whenever possible. The following precautions are advised:

-Use EPA-approved bug spray with one of the following active ingredients: DEET (at least 20% strength), picaridin, IR3535, and oil of lemon eucalyptus or para-menthane-diol.

-Minimize outdoor activity at dawn and at dusk when mosquitoes are most active.

-Put insect netting over strollers and playpens.

-Wear long sleeves and long pants whenever possible, particularly if you are outdoors during dawn and dusk.

-Remove anything around your house and yard that collects water; just one cup of water can produce hundreds of mosquitoes.

-Clean gutters and downspouts to ensure proper drainage, and repair holes in window screens.

-Remove any water from unused swimming pools, wading pools, boats, planters, trash and recycling bins, tires, and anything else that collects water, and cover them.

-Change the water in birdbaths at least two times a week, and rinse out birdbaths once a week.

Horses are particularly susceptible to WNV and EEE. Horse owners are advised to vaccinate their animals early in the season and practice the following:

-Remove or cover areas where standing water can collect.

-Avoid putting animals outside at dawn, dusk, or during the night when mosquitoes are most active.

-Insect-proof facilities where possible and use approved repellants frequently.

-Monitor animals for symptoms of fever and/or neurological signs (such as stumbling, moodiness, loss of appetite) and report all suspicious cases to a veterinarian immediately. If you are unsure if your horse is properly vaccinated you should consult with your veterinarian.

Visit http://www.health.ri.gov/mosquito for additional mosquito prevention tips, videos, and local data. DEM and RIDOH also remind Rhode Islanders to take precautions to avoid mosquito bites when traveling to Zika-affected countries. Pregnant women and women who are considering becoming pregnant should not travel to countries with active transmission of Zika.

Mosquitoes are trapped weekly by DEM and tested at the RIDOH State Health Laboratories. Last year, the RIDOH State Health Laboratories changed their testing methodology to use a more sensitive testing method which may account for an increase in positive results going forward. DEM issues advisories on test results from late June through September, with additional reports as necessary. Test results are pending for traps set on August 6 and will be included in future announcements. Typically, positive test results trigger additional trapping to assess risk.

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