DPH: First Human Case of West Nile Virus Identified In CT for 2017 Season

First Human Case of West Nile Virus Identified In CT for 2017 Season

The Connecticut Department of Public Health (DPH) today announced that a resident of New Haven has tested positive for West Nile virus (WNV) infection. This is the first human case of WNV associated illness identified in Connecticut this season.

The patient, between 50-59 years of age, became ill during the last week of August. The patient was hospitalized with high fever, dehydration and confusion. Laboratory tests confirmed the presence of antibodies to WNV in the patient’s cerebrospinal fluid.

"The identification of a Connecticut resident with West Nile virus associated illness that required hospitalization underscores the potential seriousness of the infection," said DPH Commissioner Dr. Raul Pino. "Using insect repellent, covering bare skin and avoiding being outdoors during the hours of dusk and dawn are effective ways to help keep you from being bitten by mosquitoes."

"We continue to have weather conditions that are favorable for the mosquitoes that transmit West Nile virus," said Dr. Philip Armstrong, Medical Entomologist at the Connecticut Agricultural Experiment station (CAES). "These mosquitoes are most abundant in urban and suburban areas with dense human populations. West Nile virus positive mosquitoes were first identified in New Haven on August 16th."

West Nile virus has been detected in the state every year since 1999. During 2017, WNV has been detected in mosquitoes collected at trap sites in 26 towns including: Branford, Bridgeport, Darien, Farmington, Glastonbury, Greenwich, Groton, Guilford, Middlefield, Wilford, New Canaan, New Haven, North Branford, North Stonington, Norwalk, Orange, Plainfield, Redding, Shelton, South Windsor, Stamford, Stratford, Voluntown, West Hartford, West Haven and Westport. Mosquito trapping and testing began on June 5th with the first positive mosquitoes identified on June 29th in West Haven.

Exposure to mosquitoes and the risk of acquiring WNV infection varies by season and geographic region. In Connecticut, the risk is highest during August and September and typically subsides in October as mosquitos die off due to lower temperatures.

The State of Connecticut Mosquito Management Program is a collaborative effort involving the Department of Energy & Environmental Protection, the Connecticut Agricultural Experiment Station, the Department of Public Health, the Department of Agriculture, and the University of Connecticut Department of Pathobiology and Veterinary Science. These agencies are responsible for monitoring the potential public health threat of mosquito-borne diseases.

The CAES maintains a network of 91 mosquito-trapping stations in 72 municipalities throughout the state. Mosquito traps are set Monday – Thursday nights at each site every ten days on a rotating basis. Mosquitoes are grouped (pooled) for testing according to species, collection site, and date. Positive findings are reported to local health departments and on the CAES website at http://www.ct.gov/caes/mosquitotesting.

For information on WNV and other mosquito-borne viruses and how to prevent mosquito bites, visit the Connecticut Mosquito Management Program Web site at www.ct.gov/mosquito.

Content Last Modified on 9/8/2017 2:36:47 PM