Tag Archives: Tick

Allergic to red meat? Blame a tick

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Based on new findings, scientists suspect people are more likely than first thought to develop a red meat allergy if they’re bitten by a tick. (Courtesy Spectrum Health Beat)

By Robert Preidt, HealthDay


Certain tick bites can cause a red meat allergy—and now scientists are shedding new light on the condition, known as alpha-gal syndrome.


Alpha-gal is a sugar found in most mammal blood, but not in humans.


“Our original hypothesis was that humans developed the allergy after being exposed to alpha-gal through a tick that had fed on a deer, dog or other small mammal that has alpha-gal,” said researcher Scott Commins.


When people develop an allergic immune response to alpha-gal, it can lead to a red meat allergy, explained Commins, who is an associate professor of medicine at the University of North Carolina School of Medicine in Chapel Hill.


“This new data suggests that ticks can induce this immune response without requiring the mammal blood meal, which likely means the risk of each bite potentially leading to the allergy is higher than we anticipated,” he said in a university news release.


In this study, scientists did a series of laboratory experiments with human immune cells and saliva from four species of ticks: Lone Star, deer, Gulf Coast and American dog. Some had fed on blood containing alpha-gal, others had not.


As expected, saliva from Lone Star and deer ticks that had recently fed on blood containing alpha-gal caused an immune cell reaction. But saliva from ticks that had not recently fed on blood also triggered a reaction, the findings showed.


“These results suggest that more tick bites than we initially suspected could pose a risk for developing red meat allergy,” Commins said.


However, no saliva from the Gulf Coast or the American dog ticks caused a reaction, according to the report.


The study was presented Saturday at an American Academy of Allergy, Asthma and Immunology meeting, in San Francisco. Research presented at meetings should be considered preliminary until published in a peer-reviewed journal.


There is no treatment for alpha-gal syndrome, other than avoiding foods and products that cause a reaction, the researchers noted.


Reprinted with permission from Spectrum Health Beat.



Tick, tick, boom!

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A black-legged tick poses on a leaf, waiting for an animal to brush up against it, so it may crawl on its new blood host. (Courtesy Spectrum Health Beat)

By Health Beat staff


They lie in wait in the tall grass, hoping to hop onto unsuspecting passersby.


They’re just teeny-tiny ticks, but these dark-bodied bloodsuckers can pack a powerful—and potentially serious—punch.


And this year, the ticks are out in full force, experts say. The season is expected to be an especially bad one for ticks, because of an overall warming trend and a wet winter and spring.


“Many of us have heard about the tick boom,” said Rosemary Olivero, MD, a pediatric infectious disease specialist with the Spectrum Health Medical Group. “It’s important to remember that we always expect a dramatic increase in the presence of all types of ticks during this time of year.”


The Michigan Department of Community Health has reported an increase in black-legged ticks along the Lake Michigan shorelines during the past seven years. The black-legged tick was formerly referred to as the deer tick.


Brian Hartl, an epidemiologist at the Kent County Health Department’s Communicable Diseases division, said the tick boom has been a multi-year trend.


“In terms of ticks, we don’t do any surveillance, per se, but we know the tick habitats are spreading eastward,” Hartl explained. “Historically, black-legged ticks—those that carry Lyme disease—have been on the lake shore. But they’re expanding inland from the lakes.”


But there’s more trouble to ticks than just Lyme disease, Dr. Olivero said.


“The black-legged tick can transmit Lyme disease, which is the most common tick-borne infection in Michigan,” she said. “The same tick can also transmit Anaplasmosis and Babesiosis, which almost never occur in Michigan. Other ticks (such as the American Dog tick, Lone Star tick, Woodchuck tick and Brown Dog tick) can transmit other diseases: Rocky Mountain spotted fever, Tularemia, Ehrlichisos, Anaplasmosis and Babesiosis. Luckily these infections are quite rare in Michigan.”


Just last year, the Centers for Disease Control and Prevention issued a warning about a general uptick in all insect-borne illness.


This arrived on the tails of the agency sharing news about a new, formerly rare tick-borne illness—the Powassan virus. Seventy-five cases of Powassan were reported in the United States in the past 10 years, but that number is expected go up as the ranks of mice and the ticks that carry the disease increase.


Symptoms of this serious infection can include fever, headache, vomiting, weakness, confusion, seizures and memory loss. Long-term neurologic problems may occur. The CDC notes there is no specific treatment, but some people need to be hospitalized to receive respiratory support and intravenous fluids or medications to reduce swelling in the brain.


Hartl said the best defense against ticks is to make it tough for them to latch on in the first place.


“Really it’s just being cognizant of your environment,” he said. “If you’re camping or hiking, wear pants or long socks to keep from getting ticks. They like to hang out in long grass and grab hold of you as you walk by.”


And if you do find a tick attached to your body, properly remove it. There are some videos online for how to do so. Dr. Olivero recommended this video for the proper way to remove ticks. For Lyme disease to be transmitted, ticks need to be attached for 24 to 48 hours.


“If you can remove it quickly enough you can keep from getting Lyme disease,” Hartl said.


Dr. Olivero agreed.


“There are two effective ways to prevent tick bites: wearing long sleeves, and using insect repellents,” she said. “Doing daily tick checks to remove any attached ticks can help prevent contracting Lyme disease from a tick. Important areas to check for ticks include the hairline and behind the ears. Carefully, using pointed tweezers, is the most effective way to remove a tick.”


Reprinted with permission from Spectrum Health Beat.