Elephantiasis

Elephantiasis 歌词

歌曲 Elephantiasis
歌手 英语听力
专辑 VOA慢速英语:健康报道
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[00:00.10] From VOA Learning English,
[00:03.25] this is the Health Report.
[00:05.29] Scientists are working on ways to
[00:09.22] stop a disease
[00:11.06] that threatens one-fifth of the world's population.
[00:15.05] Over 120 million people
[00:19.53] are infected with lymphatic filariasis,
[00:23.46] also known as elephantiasis.
[00:27.06] The disease is found mainly in Southeast Asia and Africa.
[00:33.24] It effects the lymphatic system
[00:37.13] which is a major part
[00:39.37] of the body's natural defense for fighting disease.
[00:44.00] Elephantiasis can cause swelling
[00:48.50] or enlargement of skin and tissue.
[00:52.33] The cause is a tiny worm
[00:56.26] that enters and lives in lymphatic tubes
[01:00.15] for six to eight years.
[01:02.59] Scientists say
[01:05.03] they have been able to demonstrate
[01:07.87] that the most common cause of elephantiasis
[01:11.91] can be stopped.
[01:13.50] They are urging those at risk
[01:16.98] to sleep under nets
[01:19.47] treated with chemicals
[01:21.06] that kill a common insect - the mosquitoes.
[01:25.20] Lisa Reimer teaches at the Liverpool School
[01:29.93] of Tropical Medicine.
[01:31.87] She formerly served in Papua New Guinea,
[01:35.86] as part of the team studying the disease.
[01:40.29] The team involved researchers from Papua New Guinea,
[01:44.93] Britain, Australia and the United States.
[01:49.46] Doctor Reimer says
[01:52.31] she was surprised at how effective
[01:56.14] anti-malaria bed nets covered with insecticide
[02:00.07] could be at fighting the disease.
[02:03.07] "Filariasis is only picked up
[02:04.96] by mosquitoes late in the evening,
[02:06.70] so this is the time
[02:08.34] when people are more likely to be protected
[02:10.03] by their bed nets.
[02:11.03] So we found that bed net use actually
[02:12.53] is a greater barrier against
[02:14.02] filariasis transmission
[02:15.32] whereas malaria transmission may still be occurring
[02:17.36] outside the times when the user is under the net."
[02:20.14] Doctors normally use drugs to fight the disease.
[02:24.04] Ms Reimer says doctors in Papua New Guinea
[02:29.16] gave the drugs to people of five villages.
[02:33.44] She says this treatment nearly ended
[02:37.87] the threat from the worm to humans,
[02:41.07] but the drugs didn't stop the threat from mosquitoes.
[02:45.99] The treated nets
[02:48.63] block female mosquitoes from securing blood,
[02:52.62] which is necessary for them to reproduce.
[02:56.65] The insecticide also cuts the life of the insects in half.
[03:02.78] "If we can reduce mosquito-biting rates
[03:05.47] then we're able to increase the thresholds
[03:08.41] below which the disease prevalence will move to zero.
[03:11.95] So by controlling mosquitoes we're making the targets
[03:15.51] for the mass drug administration more obtainable."
[03:17.86] The World Health Organization (WHO) has
[03:20.30] set a goal of stopping lymphatic filariasis
[03:24.93] as a public health problem by the year 2020.
[03:29.71] The WHO estimates that 1.4 billion people
[03:35.89] in 73 countries are at risk of the disease.
[03:40.36] Children are often infected,
[03:43.81] but they do not show signs of the disease
[03:46.99] until later in life.
[03:49.08] And that's the Health Report from VOA Learning English.
[03:55.25] I'm Bob Doughty.
Elephantiasis 歌词
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