Co-infection of broilers with Ornithobacterium rhinotracheale and H9N2 avian influenza virus

BMC Veterinary Research

Cheng He²  Na Hou³  Changbo Ou³  Yong Ling³  Faming Zhang¹  Aijing Liu³  Qing Pan³ 

[1]Beijing Veterinary Biological Manufactory, Beijing, 102600, China

[2]College of Veterinary Medicine, China Agricultural University, Yuanmingyuan Xilu, Haidian District, Beijing, 100193, P.R. China

[3]Key Lab of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China

关键词: Broiler;    Co-infect;    H9N2;    Ornithobacterium rhinotracheale;    Characterisation;    Isolation;   

Others  :  1119783
DOI  :  10.1186/1746-6148-8-104

 received in 2011-11-08, accepted in 2012-07-02,  发布年份 2012

【 摘 要 】

Background

Since 2008, a progressive pneumonia has become prevalent in broilers and laying hens. This disease occurrs the first day after hatching and lasts more than 30 days, resulting in approximately 70% morbidity and 30% mortality in broilers. The objective of this study was to isolate and identify the pathogens that are responsible for the progressive pneumonia and establish an animal model for drug screening.

Results

193 serum samples were collected from 8 intensive farms from 5 provinces in China and analysed in the current research. Our clinical survey showed that 65.2% to 100% of breeding broilers, breeding layers, broilers and laying hens were seropositive for ORT antibodies. From 8 intensive farms, six ORT isolates were identified by PCR and biochemical assays, and two H9N2 viruses were isolated. Newcastle Disease Virus (NDV) and Infectious BronchitisVirus (IBV) were excluded. Typical pneumonia and airsacculitis were observed both in broilers inoculated intraperitoneally with an ORT isolate alone and in those co-infected with ORT and H9N2 virus isolates. Specifically, the survival rate was 30%, 20%, 70%, 50% and 90% in birds inoculated with ORT+H9N2 virus, ORT followed by H9N2 virus, H9N2 virus followed by ORT, and ORT or H9N2 virus alone, respectively.

Conclusions

The results of this study suggest that ORT infections of domestic poultry have been occurring frequently in China. ORT infection can induce higher economic losses and mortality if H9N2 AIV is also present. Although the isolation of ORT and H9N2 virus has been reported previously, there have been no reported co-infections of poultry with these two pathogens. This is the first report of co-infection of broilers with ORT and H9N2 virus, and this co-infection is probably associated with the outbreak of broiler airsacculitis in China, which has caused extensive economic losses.

【 授权许可】

   
2012 Pan et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1 .

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