In the most severe cases the lesions caused by the virus in great tits can prevent the birds from feeding or flying and makes them more vulnerable to predators.
在最严重的情况下，大山雀身上由病毒引起的病变，可剥夺鸟儿进食或飞行的能力，使它们更容易受到捕食。
Remarkably, in 1996 fruit bats (flying foxes) were found to be the natural host of the virus.
非常引人注目的是，1996年发现果蝠（飞狐）是该病毒的天然宿主。
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