Tick numbers increase

Babesiosis is a malaria-like illness that causes fever and fatigue疲倦and can prove fatal致命的. It's one of a handful極少數 of diseases carried by ticks蜱 that are increasingly infecting people in the US. And while only a few hundred cases have been reported in recent years, scientists say that number is rapidly increasing. Dr Peter Krause, a specialist at the Yale School of Public Health, says the ticks are carried by white-tailed deer白尾鹿 that were once almost extinct滅絕的 in parts of the country.

"Deer are very important in the life cycle of the ticks that transmit the diseases because they provide a place for the ticks to... over winter... to reproduce and to feed. And deer have markedly increased over the past 50 years in the northeast of the United States due to reforestation造林."

The return of the white-tailed deer is a conservation保護 success story in America. But their numbers are now so great that many people regard them as a nuisance討厭的人 and a potential health threat. Controlling their population may be one way to help stop the spread of illnesses.

"There have been a few studies showing that, with a marked reduction in number of deer, the number of ticks drops dramatically急速下降, and in these studies the number of cases of Lyme disease drops dramatically. That's one of several approaches方法 that researchers are looking at."

Other tick-borne diseases causing concern include Deer Tick Virus and Human Granulocytic粒細胞 Anaplasmosis. As with Babesiosis, relatively few cases have been reported so far, but scientists say they're worried by the rising trend.

http://www.bbc.co.uk/worldservice/learningenglish/language/wordsinthenews/2012/11/121126_witn_tick_numbers_increase_story.shtml