VOA慢速英语 通过蚊子传播的疾病
A virus causes yellow fever. A few days after a mosquito bite, the victim experiences high body temperature and pain in the head or muscles. Victims also may expel food they ate. Most patients improve after three to four days.
VOICE ONE:
However, fifteen percent of patients develop a more serious condition. High body temperatures return and the body turns yellow in color. The victim bleeds from the nose, mouth, eyes or stomach. Half the people with this condition die within ten to fourteen days.
A vaccine can prevent yellow fever. Experts say the vaccine is safe and very effective. The protection continues for at least ten years and possibly for life.
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VOICE TWO:
Mosquitoes also carry lymphatic filariasis, also known as elephantiasis. The disease has affected more than one hundred twenty million people. One-third of those infected live in India. Another third are in Africa. The others live in South Asia or islands in the Pacific Ocean.
Mosquito bites spread the worms that cause elephantiasis. People usually begin to develop the disease as children. Many children never experience signs of the disease. But it may cause hidden damage to the body's lymphatic system and kidneys.
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