Tick-bite emergency room visits are rising as Illinois tick season reaches one of its busiest periods. Federal health data shows weekly tick-bite ER visit rates in every U.S. region except the South Central states are at their highest level for this point in the year since 2017, according to the Centers for Disease Control and Prevention.

Illinois tick season brings several species into focus

The Illinois Department of Public Health says ticks are generally most active in April, May and June, although activity can continue through summer and into mid-fall because species have different life cycles.

Common ticks in Illinois include the Lone Star tick, recognizable by a white dot on its back. Active from April through the end of July, it may cause Alpha-gal syndrome, which can trigger an allergy to red meat.

The blacklegged tick, or deer tick, has a reddish-brown body and black shield. It is active from April through October and may transmit Lyme disease, babesiosis and anaplasmosis. It is often found in yards, parks, gardens and wooded edges.

The brown dog tick can remain active year-round and is often found in homes with dogs or in kennels. It may transmit Rocky Mountain spotted fever.

The American dog tick, which is most active from April through June, may transmit Rocky Mountain spotted fever and tularemia. It is commonly found in grassy fields, along walkways and near forest edges.

How to prevent tick bites in Illinois

Health officials recommend checking people and pets after outdoor activity, wearing light-colored clothing and long sleeves, using insect repellent containing DEET and staying near the center of trails. An attached tick should be removed promptly with tweezers.

The increase in ER visits makes prevention especially important during peak activity. Knowing where ticks live, how to identify common species and how to remove them can help Illinois residents reduce exposure while spending time outdoors.