The researchers studied three mosquito species that transmit yellow fever, Zika or West Nile fever.

研究人员对传播黄热病、寨卡病毒和西尼罗河热的三种蚊子进行了研究。

The city estimates that there have been 12,000 undiagnosed cases of West Nile fever.

纽约市估计，有1.2万例未确诊西尼罗发热病例。

The diagnosis of west nile fever is usually not clinically indicated unless findings of meningitis or encephalitis are present.

诊断通常不是必须的，除非存在脑膜炎和脑炎。

The virus causes a disease called West Nile fever, which normally causes mild symptoms, but can progress to full-blown encephalitis or meningitis.

此病毒可导致西尼罗河热，一般症状较轻，不过也可进展为严重的脑炎和脑膜炎。

The virus causes a clinical syndrome called west nile fever, but can progress to meningitis or encephalitis in the elderly, those with significant health problems, immunocompromised or young children.

这种病毒可以导致一种叫做西尼罗河热的综合征，但是在老年人、有严重健康问题的人、免疫低下人群、小儿中，可进展为脑膜炎和脑炎。