传染源鸟是该病毒的贮存宿主,是WNV感染的主要传染源,目前已查明有70多种鸟与传播该病毒有关,其中有些鸟的死亡率很高,如乌鸦,大乌鸦,喜鹊,蓝鸟和灰鸟,但鸟的种类目前尚未完全清楚.病人和隐性感染者亦应该是该病毒的传染源,但还未得到证实.血清学检查提示,在一次流行中,有很多隐性感染者但只是有轻微症状或无症状。 The source bird of infection is the host of the virus and the main source of infection for WNV infection. So far, more than 70 kinds of birds have been identified as being transmitted by the virus. Some of these birds have high mortality rates such as raven, raven, magpie, Blue birds and gray birds, but the species of birds is not yet fully understood.Patients and latent infections should also be the source of the virus, but has not been confirmed.Serological tests suggest that in a popular, there are many hidden Infected but only mild or asymptomatic.