According to the Department of Public Health, the St. Louis area is home to more than 50 different species of mosquito.
Health officials said that doesn't automatically mean there's cause for alarm.
"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, in a statement.
West Nile Virus is a disease that is spread through bites of mosquitoes, which become infected after feeding on infected birds.
"The identification of two CT residents with West Nile virus associated illness that required hospitalization underscores the potential seriousness of infection", said DPH Commissioner Dr. Raul Pino in a statement.
"Early symptoms can include fever, muscle weakness, stiff neck, confusion, severe headache, sudden sensitivity to light, tremors, numbness, or vision loss". MDH says there were 30 West Nile cases last year and 83 the year before. The Centers for Disease Control and Prevention say that one in 150 people infected develop a serious illness that affects the central nervous system.
House mosquito (Culex): This species is most known as the carrier of the West Nile Virus.
This year, deaths have so far been reported in Iowa, North Carolina and Texas.
This year, West Nile has not yet been found in a Wisconsin resident.
The risk of West Nile virus infection is at a level not seen since 2012 when an outbreak infected 290 IL residents, the North Shore Mosquito Abatement District announced Thursday. Wearing light-coloured, long-sleeved shirts, pants, socks and a hat is recommended, as is using insect repellent containing DEET or Icaridin.