Deer ticks that cause Lyme disease and other ailments are moving north and west in Minnesota, and health officials say people should be on the lookout for the tiny critters now that spring is here.
In northwestern Minnesota, southern Beltrami County, southeastern Clearwater County, eastern Becker County and all of Hubbard and Cass counties now are considered high-risk areas for tick-borne diseases.
That means outdoors enthusiasts in many parts of northwestern Minnesota now have one more thing to worry about.
"People aren't used to thinking about ticks or tick-borne diseases" in many of those areas, said Melissa Kemperman, an epidemiologist for the Minnesota Department of Health.
According to Kemperman, the number of Lyme disease cases in Minnesota set a record in 2007. Final numbers aren't yet available, but Kemperman said more than 1,200 people contracted the tick-borne disease last year.
The previous record was 1,023 reported cases in 2004. In 2006, the Department of Health reported 913 confirmed cases of Lyme disease in Minnesota.
Lyme disease causes joint pain and inflammation and can damage the heart and nervous system if left untreated. Kemperman said the statistics show the disease definitely is moving north and west.
Deer ticks also can transmit anaplasmosis and babesiosis, diseases that are less common than Lyme disease but potentially more serious if left untreated.
All of the diseases are treatable and produce flulike symptoms in their early stages.
Kemperman said deer ticks thrive in hardwood forest habitat with brushy areas. That likely limits the chances of finding them in less forested areas in the far northwest corner of the state and across the Red River in North Dakota.
Still, people who live or spend time in forested areas where deer ticks weren't a problem in the past definitely need to be on the lookout, Kemperman said.
That can be tricky because deer ticks are much smaller than a wood tick. An adult deer tick is about the size of a sesame seed, and the nymphs are even smaller.
"You're not going to find them in the middle of a wetland or grassy area, but where there's forest, you could find them," Kemperman said. "We're definitely worried about that."
North Dakota recorded 11 cases of Lyme disease from 2002 through 2006, according to Erin Fox, epidemiologist for the North Dakota Department of Health. She said many of the cases were attributed to out-of-state travel.
With levels of the disease that low, Fox said it's difficult to establish any information on prevalence or disease trends. Numbers for 2007 aren't yet available, she said.
Kemperman said she's already hearing reports of people finding adult deer ticks in Minnesota. The nymphs start coming out in May, and the period from May through July is the peak time for encountering deer tick nymphs. Adult deer ticks become abundant again in fall.
To reduce the risk of deer ticks, Kemperman said people should avoid walking directly into brush. It's also a good idea to wear light-colored clothing to make the ticks more visible and tuck pant legs into boots or socks.
Kemperman said people should apply repellants such as DEET or permethrin when venturing outdoors. DEET can be applied both to skin and clothing, while people only should apply permethrin to clothing, Kemperman said.
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