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Causes of Yellow fever原因黄热病

Yellow fever is caused by a virus called the flavivirus.  It is passed on by the bite of a type of mosquito known as Aedes aegypti.黄热病是由病毒引起的，称为黄，它是通过对所咬一类蚊子被称为埃及伊蚊。

First, the mosquito becomes infected by biting an animal or human with the virus.  It can then pass it on to any other animals or humans that it bites.  Once it is infected a mosquito remains a source of danger throughout its life.第一，成为蚊子咬感染的动物或人类与病毒，它便可以通过它在任何其他动物或人类，它叮咬，一旦感染蚊子仍然是一个危险的根源在其整个生命。

It is thought that the virus is widespread amongst the monkeys that live in the tops of trees in the jungle (the jungle 'canopy') in some parts of Africa and America.据认为，这种病毒很普遍，其中猴子说，住在毛条的树木在丛林中（丛林'天篷' ）在部分非洲和美洲。

Occasionally, an infected mosquito passes the disease on to a someone in the jungle (eg a forestry worker) who can then act as a source of infection when they return to their own community.偶尔，受感染的蚊子通过这一疾病对一个有人在丛林中（例如，一个林业工人）谁可以采取行动，然后作为一个感染源，当他们返回自己的社区。