[Evaluation of the protection conferred by several avian infectious bronchitis attenuated vaccines against the field strain CK/CH/LDL/97 I in China].
Bing Du Xue Bao
; 24(2): 111-6, 2008 Jun.
Article
in Zh
| MEDLINE
| ID: mdl-18536105
ABSTRACT
The entire S1 protein gene of five infectious bronchitis (IB) vaccine strains (JAAS, IBN, Jilin, J9, H120) used in China were compared with that of the IB field isolate CK/CH/LDL/97 I present in China. The nucleotide and deduced amino acid similarities between the five IB vaccine strains and the field strain, CK/CH/LDL/97 I, were not more than 76.4% and 78.7%, respectively. Phylogenetic analysis based on the S1 gene showed that the vaccine strains and the field strain belonged to different clusters and had larger evolutionary distances, indicating that they were of different genotypes. The five vaccine strains were used for protection test against challenge of the field isolate CK/CH/LDL/97 I. The chickens inoculated with five vaccine strains showed morbidity as high as 30%-100% after challenged with the CK/CH/ LDL/97 I strain. The organ samples at 5 days post challenge showed that the viral detection rates were 50%-90% and 10%-30% for trachea and kidney, respectively. The live attenuated vaccines only provided partial protection to the vaccinated chickens against heterologous IBV infection, CK/CH/LDL/97 I.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Poultry Diseases
/
Viral Vaccines
/
Chickens
/
Coronavirus Infections
/
Infectious bronchitis virus
Limits:
Animals
Language:
Zh
Journal:
Bing Du Xue Bao
Journal subject:
VIROLOGIA
Year:
2008
Document type:
Article
Affiliation country:
China