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Interactions between viscerotropic velogenic newcastle disease virus and pet birds of 6 species part 1 clinical and serologic responses and viral excretion


, : Interactions between viscerotropic velogenic newcastle disease virus and pet birds of 6 species part 1 clinical and serologic responses and viral excretion. Avian Diseases 21(4): 642-654

Clinical and serologic responses to a psittacine isolate of viscerotropic velogenic Newcastle disease virus (VVNDV) were evaluated in pet birds of 6 spp: budgerigar, yellow-headed Amazon parrot, halfmoon conure, lesser hill mynah, black-headed nun and canary. The clinical response was most marked in the budgerigars, parrots and conures, and only minimal in the nuns. Between post-exposure days (PED) 3 and 5 some birds developed ruffled plumage, conjuctivitis and CNS dysfunction: ataxia, wing tremors, paralysis of the extremities and tremors of the head accompanied by nodding and jerking. Mortality by PED 203 was 55% (29/52) in the halfmoon consures, 22% (23/105) in budgerigars, 29% (12/42) in parrots and 21% (15/71) in nuns. The only clinical signs in canaries and mynahs were progressive death losses, respectively 25% (33/132) and 21% (10/48). The visceral lesions common in chickens with VVNDV were not observed in these 6 spp. Canaries rapidly eliminated Newcastle disease virus (NDV), whereas it was detected for protracted periods in the oral and cloacal secretions of the other 5 spp. (for more than 1 yr in parrots). Serologic evaluation by the hemagglutination-inhibition and neutralization tests also indicated prolonged NDV infections in 5 of the 6 spp. The seroconversion rate observed in canaries was minimal (13%).

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