It seems rather early in the season to worry about mosquitoes, especially when we're still waiting for the Cicadapocolypse to arrive in Northern Illinois.

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But, due to a mild winter and spring, areas of Illinois already have to use repellent because of these buzzing pests.

Mosquitoes in Illinois Threaten Those With a Weakened Immune System

The Illinois Department of Health is warning residents of a potential threat due to mosquitoes recently testing positive for West Nile Virus.

According to the press release, two batches of mosquitoes were discovered at Hoffman Estates on May 14 and in Jacksonville on May 16 with West Nile virus.

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IDPH Director Dr. Sameer Vohra said that it is "important for everyone - and especially older people and those with weakened immune systems - to safeguard themselves and their families from mosquitoes and the viruses they carry by wearing insect repellent and eliminating standing water around their home."

Here's What To Do If You See a Dead Bird in Illinois or Wisconsin

IDPH monitors West Nile by collecting "mosquito batches and dead birds, as well as testing sick horses and humans" with virus-like symptoms.

If you notice a dead crow, blue jay, robin, or other perching bird, contact your local city health department, who will determine if the bird needs to be picked up for testing.

There are no vaccines to prevent West Nile, but in most cases, those who have the virus don't have symptoms,

According to the CDC, there are about 1 in 5 people who are infected develop a fever and other symptoms. "About 1 out of 150 infected people develop a serious, sometimes fatal, illness."

LOOK: 20 of the biggest insects in the world

Stacker compiled a list of 20 of the biggest insects in the world using a variety of news, scientific, and other sources.

Gallery Credit: Andrea Vale

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