Pathogen origin

JC Jun Chu
QZ Qiang Zhang
TZ Tianyuan Zhang
EH Er Han
PZ Peng Zhao
AK Ahrar Khan
CH Cheng He
YW Yongzheng Wu
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Low virulence strain CB3 and high virulence HJ strain of C. psittaci were isolated from free-living birds27 and diseased pigeons28. AIV H9N2/chicken/Shandong/2011 was isolated from broilers as described previously11. The attenuated vaccine against Newcastle Diseases Virus (NDV) was purchased from Ceva-Huadou Co.Ltd, Beijing, China.

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