Lyme disease cases in Illinois expected to continue to rise this year

FILE - Tick, lyme disease

An expert says Lyme disease cases in Illinois will likely continue to rise this year after having shown a gradual increase in recent years.

Chris Stone, director of the Medical Entomology Laboratory at the Illinois Natural History Survey, said Lyme disease has doubled over the last decade.

Stone said there’s no definite way to forecast the increase of Lyme disease, which is caused by tick bites, but the trend in recent years gives experts an idea of what should be expected.

“Our expectation would be a further increase in the number of Lyme cases,” Stone said. “It has been such a gradual increase over the past few years.”

Stone said the increase in Lyme disease isn’t a one-time event appearing out of nowhere like the West Nile or Zika viruses, but there is still reason for concern.

“From a public health concern, that’s very important,” Stone said. “It’s a concern because Lyme can be dramatic or impactful for people who get it.”

Lyme disease symptoms include circular red rashes, fever, fatigue, headaches, muscle and joint pains, paralysis, numbness and can lead to death if left untreated, according to the Illinois Department of Public Health.

Stone said the tick species that transmits Lyme has been moving into Illinois steadily over the past decade, leading to the gradual increase of Lyme cases in humans.

“It has become much more prevalent,” Stone said. “The number of human cases that we see each year in Illinois has just been gradually increasing every year.”

The danger of ticks is that people are especially at risk of being exposed to them when they visit or live in natural areas, he said.

“It’s often associated with hiking, natural areas and recreation,” Stone said.

He added that people who live close to natural areas are at a greater risk because they can be exposed to the disease by picking up ticks in their backyard.

“It affects everyone from children to the elderly,” Stone said. “Anyone who’s outdoors and exposed can pick these up.”

The IDPH recommends wearing light-colored protective clothing, applying tick repellent with a 10 percent to 30 percent DEET content onto clothes and skin, avoid brushing against tall grasses or weeds and checking frequently every two to three hours to avoid tick bites..

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