QVHD Urges Residents to Continue to Take Precautions to Avoid Mosquito Bites Until Sustained Hard Frost

September 13, 2019

In August, the Quinnipiack Valley Health District (QVHD) received confirmation and shared with
residents that the North Haven Mosquito Trapping Surveillance Site, maintained by the
Connecticut Agricultural Experiment Station (CAES) had a mosquito pool test positive for West
Nile Virus (WNV). The mosquito surveillance site is located at Quinnipiac River Park in North
Haven. The CAES routinely monitors this mosquito trapping site between June and October.
Health District residents are urged to continue the below methods to avoiding mosquito bites
until the first sustained hard frost. A sustained hard frost* is overnight temperatures below
30 degrees Fahrenheit for 8 hours and the collapse of decorative yard plants.
One of the most effective ways to avoid WNV is to prevent mosquito bites by using insect
repellent. Choosing an EPA-registered repellent ensures the EPA has evaluated the product for
effectiveness. Always follow the product label instructions and reapply insect repellent as
directed. Visit the EPA website to learn more about which repellent is right for you and your
family: https://www.epa.gov/insect-repellents

Another effective way to avoid WNV is to control mosquitoes outside and inside your home. Be
sure to follow these tips from the CDC:

• Remove standing water where mosquitoes could lay eggs
• Once a week, empty and scrub, turn over, cover, or throw out any items that hold water
like tires, buckets, planters, toys, pools, birdbaths, flowerpot saucers, or trash
containers. Mosquitoes lay eggs near water.
• Tightly cover water storage containers (buckets, rain barrels) so that mosquitoes cannot
get inside to lay eggs.
• For containers without lids, use wire mesh with holes smaller than an adult mosquito.
• Use larvicides to treat large containers of water that will not be used for drinking and
cannot be covered or dumped out.
• Install or repair and use window and door screens. Do not leave doors propped open.
• Use air conditioning when possible.

For questions about WNV and humans, you can contact Quinnipiack Valley Health District, 203-
248-4528, M-F: 8:30am- 4:30pm.

Connecticut Agricultural Experiment Station, https://www.cdc.gov/westnile/prevention/index.html