|
Just like malaria, schistosomiasis is caused by a tiny parasite that' s transmitted to humans via an animal host known as a vector. The vector, in this case though, is not a mosquito but a snail. Yeah, just try there. So, let' s have a look. Yeah, that looks like one. So that snail could infect up to 100 people over a period of a couple of months. And that' s the problem. It' s the kind of scale of individuals and numbers which gives this disease such a roothold in these environments. It' s quite incredible. Well, it' s funny first, let we know we' re all standing here in waders just wearing gloves, protecting ourselves from this rather benign looking snail while, behind us. Mums are collecting water to bathe their kids in. Everyone' s gonna be drinking the water and washing its. That' s quite right. The parasite has evolved to live half of its life in the snail and half in the people it infects. |
|
rú nüè jí yí yàng, xuè xī chóng bìng shì yóu wēi xiǎo de jì shēng chóng yǐn fā de. tā huì jīng yóu yī zhǒng jiào dài jūn tǐ de dòng wù jì zhǔ, chuán bō dào rén tǐ zhī zhōng. zài cǐ qíng kuàng xià, dài jūn tǐ bú shì wén zi ér shì wō niú. shì shì lāo nà biān wǒ men lái kàn yī kàn zhè lǐ yǒu yì zhī zhè zhǐ wō niú huì zài duǎn duǎn jǐ gè yuè zhōng, chuán rǎn 100 rén zhī duō. zhè jiù shì wèn tí suǒ zài. cǐ dì rén qún de fēn bù guǎng ér mì jí, ràng zhè zhǒng jí bìng gēn zhí yú huán jìng zhōng. zhēn bù kě sī yì wǒ men zhèng zhàn zài zhè lǐ, chuān zhe fáng shuǐ xuē, dài zhuó shǒu tào, bǎo hù zì jǐ, bú huì bèi zhè gè háo bù qǐ yǎn de wō niú gǎn rǎn. dàn zài shēn hòu, mā mā zài dǎ shuǐ gěi hái zi men xǐ zǎo, suǒ yǒu rén dōu huì yǐn yòng hú shuǐ, dōu huì zài zhè lǐ xǐ shuàn méi cuò zhè zhǒng jì shēng chóng yǐ zhú jiàn jìn huà, jì kě cún huó zài wō niú zhōng, yě kě yī lài tā suǒ gǎn rǎn de rén tǐ shēng cún. |