IN-VIVO EVALUATION OF THE PATHOGENICITY OF FIELD ISOLATES OF INFECTIOUS-BRONCHITIS VIRUS

Citation
Ge. Avellaneda et al., IN-VIVO EVALUATION OF THE PATHOGENICITY OF FIELD ISOLATES OF INFECTIOUS-BRONCHITIS VIRUS, Avian diseases, 38(3), 1994, pp. 589-597
Citations number
31
Categorie Soggetti
Veterinary Sciences
Journal title
ISSN journal
00052086
Volume
38
Issue
3
Year of publication
1994
Pages
589 - 597
Database
ISI
SICI code
0005-2086(1994)38:3<589:IEOTPO>2.0.ZU;2-9
Abstract
The pathogenicity of 13 field isolates of infectious bronchitis virus (IBV) isolated from Georgia broiler farms from 1989 to 1992 was evalua ted using the IBV and Escherichia coli mixed-infection model. Based on the clinical signs, mortality, and lesions, the isolates were classif ied as high, intermediate, and low in pathogenicity. The in vivo class ification was compared with the serotype classification results obtain ed by reverse transcriptase-polymerase chain reaction-restriction frag ment length polymorphism analysis. The high-pathogenicity group was co mposed of five isolates representing three serotypes: Arkansas, Georgi a variant (GAV), and Massachusetts. Isolates in the intermediate- and low-pathogenicity groups were all representatives of the Connecticut s erotype, except for one isolate, which belonged to the Massachusetts s erotype.