Infection with WNV is either asymptomatic (no symptoms) in around 80% of infected people, or can lead to West Nile fever or severe West Nile disease.

西尼罗河病毒感染可以为无症状感染(没有症状)，约占受感染人群的80%，也可能导致西尼罗热或严重的西尼罗河疾病。

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West Nile virus can cause a fatal neurological disease in humans.

西尼罗河病毒能够引起人类致命性神经系统疾病。

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West Nile Virus (WNV) can cause neurological disease and death in people. WNV is commonly found in Africa, Europe, the Middle East, North America and West Asia.

西尼罗河病毒可以导致人类罹患神经系统疾病甚至死亡。

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The best way to prevent West Nile disease is to avoid mosquito bites.

MSN: CDC: West Nile season off to an early start

Mayo Clinic vaccine researcher Gregory Poland counts more than a dozen new diseases that have emerged in the last few decades: HIV, Lyme disease, West Nile virus, avian influenza.

FORBES: Booster Shot

West Nile is not the only developing-country disease that has seeped into America.

ECONOMIST: Infectious diseases are creeping in from abroad