Health
Tick spray may not be able to prevent Lyme disease
April 14, 2022 – Two widely used and environmentally safe Tick control Measures may reduce the number of bloodthirsty insects in your neighborhood, but they do not reduce the chances of your contract Lyme diseaseDiscovered by researchers.
Results of a four-year survey published in the May 2022 issue Emerging infectious diseases, Shown silver lining: This measure did not help people, but led to a sharp reduction in tick-borne disease in outdoor pets.
Dr. Richard Ostfeld, one of the researchers at the Cary Ecosystem Institute in Millbrook, New York, and a disease ecology scholar, said the failure of measures to reduce Lyme disease in people was an “unwelcome answer.” Say that.
Many people were involved in the study, randomized, placebo-Controlled and double-masked- “Gold standard for research design,” says Ostfeld. “We must take the result seriously.”
As a result, researchers have speculated that, contrary to common belief, people are more likely to cause Lyme disease. Tick Compete for their time when they are away from home and before those mites bite.
Dr. Felicia Keesing, another researcher at Bard College’s disease ecologist in Annandale, New York, has a long-standing assumption that “people encounter ticks that get sick when they are in the garden.” bottom. “The evidence is not very solid.”
Tick at home
Lyme disease Certain mites are caused by bacteria that can infect humans from infected animals such as deer and rodents.Approximately 30,000 Report to CDC Although annually in the United States, recent estimates indicate that lime can hit 476,000 Americans each year.
Symptoms may be mild and immediate if treated by AntibioticsOr long-term and inconvenient if untreated.
The Parasite It is also found in dogs and cats where ticks are widespread. 13.3% The number of dogs in the northeast that tested positive for antibodies.
Experts have long advised people to try some measures to avoid Tick bitesAnd the common thing was to reduce the number of creatures crawling around.
“Many literature claims that it is semi-domestic-it’s around people’s homes,” says Ostfeld. His team tested the idea of ”tapping at the source of Northeast Lyme disease” between 2017 and 2020 in 24 residential areas in Dutchess County, New York.
The average neighborhood of the survey covered 68 acres and 118 lands, about three-quarters of which were covered with tick-breeding trees, shrubs and grass. An average of 34% of households in each neighborhood participated.
The researchers chose two products to test. One was Met52. This is an antifungal spray that kills ticks that Keesing says do not tend to drift. The other was the tick control system, a collection of feeding boxes that attract small mammals that host ticks.
Once inside the box, the animal taps the pesticide fipronil, the active ingredient in products such as Frontline, a cure for fleas and ticks for pets. Researchers chose the product because they are relatively harmless and available.
“We didn’t want to do any research to document the effectiveness of anything. [people] It couldn’t be used, “says Ostfeld.
The study was double masked with a placebo control. That is, some homes received both treatments, some received one each, and some received nothing, but neither the homeowner nor the researcher knew the assignment.
Studies have found that fungal sprays did not affect the number of attached mites or mites actively looking for a host. However, the graduation box reduced the graduations found in rodents by about 50%.
Of concern, researchers say that the reduction of ticks did not lead to a reduction in people’s illness. Overall, the people in this study reported 130 cases of tick-borne disease, and researchers found statistically significant differences in characteristics between those with fungal sprays or tick boxes and those without. did not.
Researchers have found that the number of illnesses people have reported about outdoor pets has been “significantly reduced.” “They go to every corner of our garden,” says Keysing.
“It’s too bad”
Holly Ahan, associate professor of microbiology at SUNY Adirondack in Queensbury, NY, said:
Lime can be the cause liver Ahan, a Lyme disease activist whose daughter fell ill in 2002, says pet heart disease. [the mitigation] We will do nothing more to prevent tick-borne Lyme disease in humans. “
After all these years, Ahan said he was relieved to understand that mitigation measures may not be sufficient and that there are other ways for research to protect against illness. increase.
“It’s frustrating that these large-scale preventive studies have consistently failed to prevent Lyme disease,” Wendy Adams, director of research grants for the Bay Area Lyme Foundation in Portola Valley, California, said in a statement. I’m sorry. “
One topic of future research is to learn where people will eventually encounter sick mites, even when they are not at home. “There is very little reliable data,” says Ostfeld.
Married Keithing and Ostfeld say people may have picked it up on a hike. “Dani crawls for hours and days before deciding where she wants her mouth to stick to her skin,” says Ostfeld.
“Most people don’t spend all their time on their property,” says Dorothy Leland, vice president of patient advocacy group LymeDisease.org. “We take dogs for a walk in the neighborhood, children play in parks and playgrounds. Many adults work outdoors.”
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