For Immediate Release - September 08, 2017

State Health Officials Announce First Human Case of West Nile Virus in Massachusetts

Residents urged to take precautions to avoid mosquito bites

BOSTON — The Massachusetts Department of Public Health (DPH) today announced the first human case of West Nile virus (WNV) in the state this year. The patient is a resident of Bristol County in his 50s who was confirmed with WNV by testing completed today by the Massachusetts State Public Health Laboratory. The patient remains hospitalized.

DPH is conducting an epidemiological investigation to determine where the individual was most likely exposed to infected mosquitoes. Any change in the assessment of WNV risk areas will depend on the findings of this investigation.

“This patient would have been bitten by an infected mosquito in early to mid-August which is the beginning of the peak season for possible West Nile virus human infections,” said DPH State Public Health Veterinarian Dr. Catherine Brown. “There have been so many WNV infected mosquitoes identified this year throughout the Commonwealth that the risk is widespread and ongoing. That means that this year, it is extremely important to take steps to avoid mosquito bites including using repellents, using clothing to reduce exposed skin, dumping standing water, and moving indoors when you notice  mosquitoes biting you.”

In 2016, there were 16 human cases of WNV infection identified in Massachusetts. WNV is usually transmitted to humans through the bite of an infected mosquito. While WNV can infect people of all ages, people over the age of 50 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 and their loved ones from illnesses caused by mosquitoes.

Avoid Mosquito Bites

Apply Insect Repellent when Outdoors. Use a repellent with 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 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.

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.

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 the 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

Water troughs and buckets provide excellent mosquito breeding habitats and should be flushed out at least once a week during the summer months to reduce mosquitoes near paddock areas. Horse, llama and alpaca owners should keep animals in indoor stalls at night to reduce their risk of exposure to mosquitoes. 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 found on the Arbovirus Surveillance Information web page at www.mass.gov/dph/mosquito or by calling the DPH Epidemiology Program at 617-983-6800.

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