Epidemiology and immunoprotection of nephropathogenic avian infectious bronchitis virus in southern China.
BACKGROUND
In last three years, 96 suspected poultry farms from different provinces in China were diagnosed for avian infectious bronchitis (IB) survey. Finally, 221 IBV strains were confirmed by dwarf embryo test and RT-PCR assay. By virus recovery trials, 187 of the isolates caused the birds died or distressed from nephritis, which was accordant with the clinical record.


RESULTS
Based on epidemiology analysis of recent field isolates of nephropathogenic IB in vaccinated farms in China, YL6 strain were used for vaccination and evaluated by antibody titer and challenge tests. The immunoprotection test indicated that the practical application of vaccine based on the recent field strains could finely facilitate controlling the nephropathogenic IB.


CONCLUSIONS
Our study was aim at setting a guide for safeguard against nephropathogenic IBV-caused disease in China.
College of Animal Science, South China Agricultural University, Guangzhou 510642, China. qmx@scau.edu.cn
Qingmei
Q
Xie
Jun
J
Ji
Jingwei
J
Xie
Feng
F
Chen
Manshan
M
Cai
Baoli
B
Sun
Chunyi
C
Xue
Jingyun
J
Ma
Yingzuo
Y
Bi
D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D002681:China; D018352:Coronavirus Infections / Q000453:epidemiology / Q000517:prevention & control / Q000662:veterinary*; D001351:Infectious bronchitis virus / Q000276:immunology* / Q000302:isolation & purification*; D011200:Poultry; D011201:Poultry Diseases / Q000453:epidemiology* / Q000517:prevention & control / Q000821:virology*; D014765:Viral Vaccines / Q000008:administration & dosage / Q000276:immunology*
D000914:Antibodies, Viral; D014765:Viral Vaccines