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Study: Head Lice Growing Resistant1 to Existing Treatments 研究发明治疗抗药性头虱新方法
In the United States, many children are returning to school after a nearly three-month summer break from classes. With the start of school, health officials are warning children and their parents about a new kind of head lice.
Being infected with head lice can cause a child to miss classes. The insects are difficult to kill. They can also cause discomfort2 in the child, who may try to remove them from the skin.
A new study suggests that lice populations in at least half of the 50 states have become resistant to the chemical pyrethroid. The substance has been used for years in products to kill the insects.
Seventeen-year old Ben Kupferman of California just returned home from a summer camp. He brought some unwanted visitors with him.
“I was just scratching my head and one of the, the lice just came out. It was a, just on my finger, crawling3 around.”
The Centers for Disease4 Control and Prevention says lice spread to anywhere between six to 12-million children in the United States every year. All these boys and girls are between three and 11-years old.
In the past, parents bought a chemical product at a store and put it on their child’s head. It usually killed the lice within a few days. But experts say the product is not as effective as it once was because the insects have developed tolerance5 and even resistance6 to it.
Angela Baker7 is a doctor at the Children’s Hospital of Wisconsin.
“Certain ones (lice) have the potential to mutate and protect themselves against whatever we’re using to try to kill them.”
David Gaines is a public health entomologist in the state of Virginia. He says lice have been developing resistance to chemical treatments for some time.
“This has probably been coming for many, many years. There’s reports of insecticide-resistant lice going back decades.”
When traditional treatments don’t work, doctors prescribe8 stronger drugs. But some parents object to using strong chemicals on their children. They instead want to use a more natural treatment.
Beverly Mann joined with other parents to create a lice-treatment business. Their company uses products that do not have strong chemicals in them.
“Well, we use an all-natural treatment oil and we do give (a) guarantee with our services. So it, it is pesticide-free. We do the combing, we do the picking, so the parent at home doesn’t have to.”
Gerry Wolburg launched9 a lice-removal business three years ago when he found lice on his daughter’s head. He uses heat to kill lice eggs.
“It desiccates the, the lice with hot air, and if you leave eggs in the hair they’re desiccated -- that means they’re, they’re shriveled up. They’re dried (up) and we like to point out that it’s like leaving a boiled egg in a hen-house -- it’s not gonna, it’s not gonna hatch10.”
Lice do not carry diseases11. But they are troubling, difficult to kill and can make the child feel bad. And they can keep children from attending school for a few days.
Words in This Story
lice – n. a small insect that lives on the bodies of people or animals
crawl(ing) – v. to move slowly
tolerance – n. a body’s ability to become adjusted to something (such as a drug) so that its effects are experienced12 less strongly
mutate – v. to change and cause an unusual characteristic or quality to develop in a plant or animal
entomologist – n. a scientist who studies insects
insecticide – n. a chemical substance that is used to kill insects
decade – n. a period of ten years
prescribe – v. to officially tell someone to use (a medicine, therapy13 or diet) as a treatment
comb – v. to smooth or separate (hair or fibers) with a comb
pick – v. to remove unwanted material from (something) by using your finger or a small tool
desiccate – v. very dry; having the water removed
shrivel – v. to cause (something) to become dry
1 resistant | |
adj.(to)抵抗的,有抵抗力的 | |
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2 discomfort | |
n.不舒服,不安,难过,困难,不方便 | |
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3 crawling | |
n.表面涂布不均v.爬( crawl的现在分词 );(昆虫)爬行;缓慢行进;巴结 | |
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4 disease | |
n.疾病,弊端 | |
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5 tolerance | |
n.宽容;容忍,忍受;耐药力;公差 | |
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6 resistance | |
n.抵抗力,反抗,反抗行动;阻力,电阻;反对;adj.抵抗的 | |
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7 baker | |
n.面包师 | |
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8 prescribe | |
vi.规定,开药方;vt.规定,命令,开处方 | |
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9 launched | |
v.发射( launch的过去式和过去分词 );[计算机]开始(应用程序);发动;开展(活动、计划等) | |
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10 hatch | |
n.孵化,舱口;vt.孵,孵出,策划;vi. 孵化 | |
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11 diseases | |
n.疾病( disease的名词复数 );弊端;恶疾;痼疾 | |
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12 experienced | |
adj.有经验的;经验丰富的,熟练的 | |
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13 therapy | |
n.治疗;疗法 | |
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