Public Health IPM
Insects, Mosquitos & Ticks in Public Health
August 25, 2014: EEE Risk Has Risen in New Hampshire
On August 22, the New Hampshire Department of Health and Human Services announced several new Eastern Equine Encephalitis (EEE) indicators in New Hampshire. One was a human case from Conway. This underlines the fact that EEE could show up almost anywhere in the state.
There are no communities in the Conway area that routinely trap mosquitoes and submit them for testing, so we don’t have a good idea how prevalent the virus is in mosquitoes from that region.
Four batches of mosquitoes from Candia and Derry tested positive for EEE. Three batches were of a bird-biting species. One was a mammal biting species, so that is a bit higher concern than positive bird-biters. These positive finds are in the area of southeastern New Hampshire that frequently shows an elevated risk of EEE. Based on past patterns, the risk is likely to go higher, and typically is highest in September, until a killing frost shuts down mosquito activity.
You can reduce the chances of becoming a victim by reducing the odds of being bitten. That could include covering up exposed skin, using repellants, and reducing outdoor activity within an hour or two of dusk, when mosquito biting peaks.
For more information about mosquito-borne diseases in New Hampshire, visit the DHHS website.
To learn more about insect repellants, see my publication.
To learn more about mosquito management options, see my publication
—Dr. Alan Eaton, UNH Cooperative Extension Entomology specialist
August 18, 2014 - NH Mosquito-Borne Disease Situation
The first batch of mosquitoes testing positive for Eastern Equine Encephalitis (EEE) has been detected in Londonderry. The announcement came Friday August 15, from the N.H. Department of Health and Human Services. This is a typical result, to have the first positive batch of the year discovered in mid-August, in the southeast part of the state. The species was Culiseta melanura, a bird-biting species that is the major vector (spreads the disease in the bird population) of EEE in New Hampshire. No West Nile Virus-positive mosquitoes or animals have been detected yet.
To put this in perspective, the state tested more than 1,360 batches of mosquitoes, five animals, and 14 people this year before this positive batch turned up. Last year the figures for the entire season were 24 batches of mosquitoes and three animals testing positive for EEE. No human cases were detected last year in New Hampshire. Friday’s announcement does not change the low risk for mosquito-borne diseases in the Londonderry area. That could change if further discoveries are made. I’ll make regular updates to this website, until hard frosts end this year’s mosquito season.
The riskiest time of year for acquiring EEE or West Nile Virus in New Hampshire is always late summer and early fall, until we have a couple of hard frosts to knock down the adult mosquito population. To reduce your risk of becoming a victim, reduce the chances of being bitten (cover exposed skin with clothing, use repellants, reduce your outdoor activity within an hour or two of dusk). To see the current test results and risk map, follow this link to DHHS’s website http://www.dhhs.nh.gov/dphs/cdcs/arboviral/results.htm
Keep watching. The risk may rise, especially in the southeast part of New Hampshire.
-Dr. Alan Eaton, UNH Cooperative Extension
Blacklegged Ticks in New Hampshire, Updated Map 2014
This map is the result of 25 years of active and passive surveillance on blacklegged tick (BLT) in New Hampshire. In the beginning, there were just three published records of this species in New Hampshire. This map compiles over 700 records, through late November 2013.
The NH Division of Health & Human Services has information and maps on Lyme disease and blacklegged tick.
Ticks can transmit several human diseases, and New Hampshire is home to many species of ticks. Learn what ticks look like, how they live, the diseases they spread, how to manage tick problems, and how to protect yourself from tick-borne diseases.
The NH Division of Health & Human Services has information & maps on mosquito-spread diseases in NH.
Eastern Equine Encephalitis (EEE) is a disease that is transmitted by mosquitos. Learn about Eastern Equine Encephalitis (EEE) and how it spreads, what types of mosquitos transmit EEE, and how to protect yourself from this disease.
Insect repellents can help you protect yourself from insect-borne diseases. Learn about the various types of insect repellents available and their efficacy.