›› 2017, Vol. 29 ›› Issue (11): 1809-1818.DOI: 10.3969/j.issn.1004-1524.2017.11.06

• Animal Scince • Previous Articles     Next Articles

Pathogenicity and epidemiological investigation of outbreaks of fowl adenovirus subpopulation Ⅰ infection in chickens in parts of southwestern China

YAO Kechang, LIU Yueyue, YOU Guojin, LI Shuyun, XIA Jing, HE Xiao, LI Wenwen, DU Lijing, HAN Xinfeng, HUANG Yong*   

  1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2017-05-12 Online:2017-11-20 Published:2017-12-05

Abstract: In 2015-2016, suspected fowl adenoviruses infections were observed in many chicken farms in southwestern China. The liver samples were collected from diseased chickens and inoculated into chicken embryo kidney cells (CEK) cultures for virus isolation, and 16 fowl adenoviruses (FAdV) strains were isolated. After PCR amplificating, sequencing and comparing the conserved sequences located in the pedestal regions adjacent to the L1 loop of the hexon genes of FAdV, all of the 16 stains could be grouped into four serotypes including FAdV-4(13/16), FAdV-8a (1/16), FAdV-8 (1/16) and FAdV-2 (1/16). Then, the delegate strains from those four different serotypes were selected to infect chickens to observe its pathogenicity to chickens, the results showed that the mortality of chickens infected with CH/SCDY/1604(FAdV-4) and CH/CQBS/1504 (FAdV-8a) was 80% and 20%, respectively, while no death of chicken was observed in chickens infected by CH/GZXF/1512(FAdV-2)and CH/CQBS/1512(FAdV-8b). It was concluded that the FAdV-4 was the predominant serotype and was highly pathogenic to chickens, and hydropericardium syndrome (HPS) was the main clinical manifestation. This results could provide reference for the epidemiological investigation and prevention of FAdVⅠinfection in southwestern China.

Key words: fowl adenovirus, hydropericardium syndrome, epidemiological investigation, pathogenicity

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