| variation in virulence of west nile virus strains for house sparrows (passer domesticus). | the observation of avian mortality associated with west nile virus (wnv) infection has become a hallmark epidemiologic feature in the recent emergence of this pathogen in israel and north america. to determine if phenotypic differences exist among different wnv isolates, we exposed house sparrows (passer domesticus) to low passage, lineage 1 wnv strains from north america (ny99), kenya (ken), and australia (kun; also known as kunjin virus). house sparrows inoculated with the ny99 and ken strains ... | 2005 | 15728874 |