| west nile and usutu virus infections in wild birds admitted to rehabilitation centres in extremadura, western spain, 2017-2019. | west nile virus (wnv) is an emerging flavivirus transmitted generally by mosquitoes of culex genus. it is maintained in an enzootic life cycle where birds act as reservoir hosts. humans and horses are also susceptible to infection, and occasionally, they suffer from neurological complications. however, they do not transmit the virus to other vectors, behaving as dead-end hosts. sporadic wnv outbreaks observed in horses and wild birds from extremadura (western spain) during 2016 and 2017 seasons ... | 2021 | 33677369 |