蚊子通常在吸食被感染人血液时获得病毒。
Mosquitoes generally acquire the virus while feeding on the blood of an infected person.
在这种细菌被发现后，被感染人数开始增加，英国已经有70人被感染，而在印度和巴基斯坦这一数字已经达到了170人。
After the bug was detected, the number of infected people began to increase, reaching more than 70 in Britain and more than 170 in India and Pakistan.
后者决定了被感染的人有多少人病情危急或是死亡。
The latter will determine how many people who are infected fall seriously ill or die.
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