According to the Department of Public Health, the St. Louis area is home to more than 50 different species of mosquito.
Dozens of states are reporting a boom in cases of people contracting West Nile Virus.
Health officials said that doesn't automatically mean there's cause for alarm.
Cases generally tend to spike during the summer and fall months, between June and September, when activity is the most common.More news: James Bond producers eyeing Idris Elba as next 007
West Nile fever generally resolves itself without treatment, but unsafe brain infections such as encephalitis or meningitis can develop in 1 out of 150 people, according to the press release.
Symptoms include severe headaches, fever, vomiting and diarrhea, with the agency recommending to seek immediate medical attention.
The illness can sometimes be fatal with about one out of 150 infected people dying from complications due to the virus. MDH says there were 30 West Nile cases last year and 83 the year before.
This year, deaths have so far been reported in Iowa, North Carolina and Texas.More news: Everton complete signing of Yerry Mina from Barcelona
Public health officials say an unusually high number of mosquitoes have tested positive for West Nile virus on Cape Cod.
Since 1999, when the virus was first detected in CT, cases have cropped up ever year. "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".
The Saskatchewan Health Authority is warning Saskatoon residents about West Nile virus after mosquitoes caught in two traps within city limits were confirmed to be infected with the virus. But the elderly and those with compromised immune systems can become seriously ill and could die.More news: Magic Leap Augmented Reality Glasses Now Available For $2,295