Sylvatic (or jungle) yellow fever: in tropical rainforests, yellow fever occurs in monkeys that are infected by wild mosquitoes.
森林型(或丛林型)黄热病：在赤道雨林中，黄热病发生在被野外蚊虫叮咬而受感染的猴子身上。
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Mosquito control programmes targeting wild mosquitoes in forested areas are not practical for preventing jungle (or sylvatic) yellow fever transmission.