Rhode Island Department of Environmental Management

235 Promenade Street | Providence, RI 02908 | 401.222.4700 | www.dem.ri.gov | @RhodeIslandDEM




PROVIDENCE – The Rhode Island Department of Environmental Management (DEM) today announced that all 92 mosquito samples from 29 traps set statewide on July 7 and July 12 have tested negative by the Rhode Island Department of Health (RIDOH) for both West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE). 



To date, in Rhode Island, there have been no findings of EEE or WNV in mosquito samples.  Two pools of mosquitoes trapped in Connecticut – one near Hartford at the center of the state, and the other near to the NY border – have

tested positive for WNV, and 14 mosquito pools in Massachusetts have tested positive for WNV. These findings are not unexpected, as WNV has become established in North America following its introduction in 1999.  The positive findings in neighboring Connecticut and Massachusetts indicate that WNV is beginning seasonal activity in our area.  WNV will become more prevalent as the season progresses, so residents are advised to reduce their exposure to mosquitoes until the first hard frost. There have been no findings of EEE in mosquito pools in Connecticut or Massachusetts.


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, residents are reminded to eliminate mosquito breeding grounds and prevent being bitten, whenever possible. The following precautions are advised.


Protect yourself

  • Put screens on windows and doors. Fix screens that are loose or have holes.
  • At sunrise and sundown (when mosquitoes that carry EEE are most active), consider rescheduling outdoor activities that occur during evening or early morning. If you must be outside, wear long-sleeved shirts and long pants and use bug spray.
  • Use EPA-approved bug spray with one of the following active ingredients: DEET (20-30% strength); picaridin, IR3535; and oil of lemon eucalyptus or paramenthane. Always read the label and follow all directions and precautions.
  • Do not use bug spray with DEET on infants under two months of age. Children should be careful not to rub their eyes after bug spray has been applied on their skin. Wash children’s hands with soap and water to remove any bug spray when they return indoors.
  • Put mosquito netting over playpens and baby carriages.

Get rid of mosquito breeding grounds

  • Get rid of anything around your house and yard that collects water. Just one cup of water can produce hundreds of mosquitoes; an unused tire containing water can produce thousands of mosquitoes.
  • Clean your gutters and downspouts so that they can drain properly.
  • 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.
  • Remove or treat any shallow water that can accumulate on top of a pool cover. Larvicide treatments, such as Mosquito Dunks can be applied to kill immature mosquitoes. This environmentally-friendly product is available at many hardware and garden stores and on-line.
  • Change the water in birdbaths at least once a week and rinse out birdbaths once a week.


Best practices for horse owners

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 repellents 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 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. DEM issues advisories on test results from July through September, with additional reports as necessary. Test results are pending for traps set between July 13 and July 22 and will be included in future announcements. Typically, positive test results trigger additional trapping to assess risk. 


For more information about DEM divisions and programs, visit www.dem.ri.gov. Follow us on Facebook at www.facebook.com/RhodeIslandDEM or on Twitter (@RhodeIslandDEM) for timely updates.



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