A Retrospective Study of Transmissible Viral Proventriculitis in Broiler Chickens in California: 2000-18.

摘要: Transmissible viral proventriculitis (TVP) is a disease of chickens, mostly in broilers 2-8 wk age. Chicken proventricular necrosis virus (CPNV), birnavirus, the etiologic agent. Characteristic gross lesions are enlargement, atony, and pallor proventriculus. Cases diagnosed California between 2000 2018 (n = 477), originating from 93 different farms representing all major companies region, were analyzed. Frequency cases varied widely years, with no recognizable seasonality. The flocks 6 61 days age; average age was 34.0 days, median 35 days. In 166 cases, 6.3% 100% submitted birds had most common findings enlarged or dilated proventriculi, thickened walls, pale mottled serosal appearance. Histopathologically, inflammation glands frequent finding. Other included necrosis, hyperplasia, both conditions glandular epithelium; glands; occasionally fibrin deposition, fibrosis, hemorrhages. Twenty-three proventriculi six tested by immunohistochemistry for presence CPNV antigen; 21 stained positive. 209 also bursa fabricii attributed to infectious bursal disease, but significant difference mean percentage proventriculus without fabricii. results show that TVP broiler confirms likely causative