West Nile Virus Returns to State; Prevention The Best Defense From Illness

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Photo: Mosquitoes with West Nile Virus have been detected in the state.

The Massachusetts Department of Public Health announced Thursday, July 7, that West Nile virus had been detected in mosquitoes in Massachusetts for the first time this year from three mosquito samples collected on July 1 in Worcester.

No human or animal cases of WNV or Eastern Equine Encephalitis have been detected so far this year. There is no elevated risk level or risk level change associated with this finding.

“This is an expected finding at this time of year and given the heat and dry conditions we have been experiencing, we are expecting to see more and more WNV activity,” said DPH State Epidemiologist Dr. Al DeMaria.

In 2015, there were 10 cases of WNV infection statewide. While WNV can infect people of all ages, people 50 and older are at higher risk for severe disease. Most people infected with WNV will have no symptoms. When present, WNV symptoms tend to include fever and flu-like illness. In rare cases, more severe illness can occur.

People have an important role to play in protecting themselves from mosquitoes-borne illness.

Avoid Mosquito Bites

  • Apply insect repellent when outdoors. Use a repellent with an EPA-registered ingredient (DEET (N, N-diethyl-m-toluamide), permethrin, picaridin (KBR 3023), oil of lemon eucalyptus [p-methane 3, 8-diol (PMD)] or IR3535) according to the instructions on the product label. DEET products should not be used on infants under two months and should be used in concentrations of 30 percent or less on older children. Oil of lemon eucalyptus should not be used on children under three years of age.
  • Be Aware of Peak Mosquito Hours. The hours from dusk to dawn are peak biting times for many mosquitoes. Consider rescheduling outdoor activities that occur during evening or early morning in areas of high risk.
  • Clothing Can Help Reduce Mosquito Bites. Wearing long-sleeves, long pants, and socks when outdoors will help keep mosquitoes away from your skin.

Mosquito-Proof Your Home

  • Drain Standing Water. Mosquitoes lay their eggs in standing water. Limit the number of places around your home for mosquitoes to breed by either draining or discarding items that hold water. Check rain gutters and drains. Empty any unused flowerpots and wading pools, and change water in birdbaths frequently.
  • Install or Repair Screens. Keep mosquitoes outside by having tightly-fitting screens on all of your windows and doors.

Protect Your Animals

  • Owners should also speak with their veterinarian about mosquito repellents approved for use in animals and vaccinations to prevent WNV and EEE. If an animal is suspected of having WNV or EEE, owners are required to report to DAR, Division of Animal Health by calling 617-626-1795 and to the Department of Public Health (DPH) by calling 617-983-6800.

More information, including all WNV and EEE positive results, can be accessed from the Arbovirus Surveillance Information web page or by calling the DPH Epidemiology Program at 617-983-6800.

West Nile Virus Detected in Mosquito Collected in Belmont

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Photo: Mosquito in Belmont.

The Massachusetts Department of Public Health announced Thursday, Aug. 6, that the West Nile virus was detected in one mosquito collected from Belmont.

WNV is transmitted to humans by the bite of a mosquito infected with the virus. While WNV can infect people of all ages, those 50 and older are at higher risk for severe infection.

As always, there are a few precautions people can do to help to protect themselves and their families:

Avoid Mosquito Bites

• Be Aware of Peak Mosquito Hours – The hours from dusk to dawn are peak biting times for many mosquitoes. Consider rescheduling outdoor activities that occur during evening or early morning. Otherwise, take extra care to use repellent and protective clothing.

• Clothing Can Help reduce mosquito bites. Although it may be difficult to do when it’s hot, wearing long-sleeves, long pants and socks when outdoors will help keep mosquitoes away from your skin.

• Apply Insect Repellent when you go outdoors. Use a repellent with DEET (N, N-diethyl-m-toluamide), permethrin, picaridin (KBR 3023), IR3535 or oil of lemon eucalyptus [p-methane 3, 8-diol (PMD)] according to the instructions on the product label. DEET products should not be used on infants under two months of age and should be used in concentrations of 30% or less on older children. Oil of lemon eucalyptus should not be used on children under three years of age. Permethrin products are intended for use on items such as clothing, shoes, bed nets and camping gear and should not be applied to skin.

Mosquito-Proof Your Home 

• Drain Standing Water – Mosquitoes lay their eggs in standing water. Limit the number of places around your home for mosquitoes to breed by either draining or getting rid of items that hold water. Check rain gutters and drains. Make sure rain barrels are covered or screened. Empty any unused flowerpots and wading pools, and change water in birdbaths frequently.

• Install or Repair Screens – Some mosquitoes like to come indoors. Keep them outside by having tightly-fitting screens on all of your windows and doors.

Information about WNV and reports of WNV activity in Massachusetts during 2015 can be found on the MDPH website at http://www.mass.gov/dph/wnv.

West Nile Risk Now at Moderate Risk Level in Belmont

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The Massachusetts Department of Public Health announced yesterday, Thursday, Aug. 7 that West Nile virus mosquito samples have been identified recently in Boston and Newton. The risk level for Boston, Newton and neighboring communities including Belmont has been increased to moderate, according to a press release from the Belmont Department of Health.

WNV is most commonly transmitted to humans by the bite of an infected mosquito. The mosquitoes that carry this virus are common throughout the state and are found in urban as well as more rural areas. While WNV can infect people of all ages, people over 50 are at higher risk for severe infection.

As always, there are a few precautions people can do to protect themselves and their families:

Avoid Mosquito Bites

  • Be Aware of Peak Mosquito Hours: The hours from dusk to dawn are peak biting times for many mosquitoes. Consider rescheduling outdoor activities that occur during evening or early morning. If you are outdoors at any time and notice mosquitoes around you, take steps to avoid being bitten by moving indoors, covering up and/or wearing repellant.
  • Clothing Can Help to reduce mosquito bites. Although it may be difficult to do when it’s hot, wearing long-sleeves, long pants and socks when outdoors will help keep mosquitoes away from your skin.
  • Apply Insect Repellent when you go outdoors. Use a repellent with DEET (N, N-diethyl-m- toluamide), permethrin, picaridin (KBR 3023), IR3535 or oil of lemon eucalyptus [p-methane 3, 8-diol (PMD)] according to the instructions on the product label.

Mosquito-Proof Your Home

  • Drain Standing Water: Many mosquitoes lay their eggs in standing water. Limit the number of places around your home for mosquitoes to breed by either draining or getting rid of items that hold water. Check rain gutters and drains. Empty any unused flowerpots and wading pools, and change water in birdbaths frequently.
  • Install or Repair Screens: Some mosquitoes like to come indoors. Keep them outside by having tightly-fitting screens on all of your windows and doors.

Information about WNV and reports of WNV activity in Massachusetts during 2014 can be found on the MDPH website at http://www.mass.gov/dph/wnv. Recorded information about WNV is also available by calling the MDPH Public Information Line at 1-866-MASS-WNV (1-866-627-7968).