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Rapid Diagnosis of Avian Influenza Virus in Wild Birds: Use of a Portable rRT-PCR and Freeze-dried Reagents in the Field
Published on: August 2, 2011
Avian influenza in backyard poultry of the Mopti region, Mali
Sophie Molia1, Abdallah Traoré, Patricia Gil
1CIRAD, UPR AGIRs, Bamako, 1813, Mali. sophie.molia@cirad.fr
Abstract:
This study reports the first evidence of circulation of avian influenza viruses (AIV) in domestic poultry in Mali. In the Mopti region, where AIV have already been isolated in migratory water birds, we sampled 223 backyard domestic birds potentially in contact with wild birds and found that 3.6% had tracheal or cloacal swabs positive by real-time reverse transcription PCR (rRT-PCR) for type A influenza viruses (IVA) and that 13.7% had sera positive by commercial ELISA test detecting antibodies against IVA. None of the birds positive by rRT-PCR for IVA was positive by rRT-PCR for H5 and H7 subtypes, and none showed any clinical signs therefore indicating the circulation of low pathogenic avian influenza. Unfortunately, no virus isolation was possible. Further studies are needed to assess the temporal evolution of AIV circulation in the Mopti region and its possible correlation with the presence of wild birds.
Insights
This study found the first evidence of avian influenza viruses (AIV) in domestic poultry in Mali. Low pathogenic AIV circulates in Mopti, highlighting the need for further surveillance in domestic and wild birds.
Area of Science:
- Veterinary Virology
- Epidemiology
- One Health
Background:
- Avian Influenza Viruses (AIV) pose a significant threat to poultry health and global food security.
- Mali's Mopti region has documented AIV in migratory water birds, suggesting potential transmission pathways.
- Understanding AIV circulation in domestic poultry is crucial for disease control and prevention.
Purpose of the Study:
- To investigate the presence and prevalence of AIV in backyard domestic poultry in Mali's Mopti region.
- To identify potential contact between domestic poultry and wild birds.
- To characterize the subtypes of AIV circulating in the studied poultry population.
Main Methods:
- Sampling of 223 backyard domestic birds in the Mopti region.
- Detection of AIV using real-time reverse transcription PCR (rRT-PCR) on tracheal and cloacal swabs.
- Serological testing using commercial ELISA to detect antibodies against AIV in sera.
Main Results:
- 3.6% of sampled birds tested positive for type A influenza viruses (IVA) via rRT-PCR.
- 13.7% of birds showed antibodies against IVA, indicating past exposure.
- No H5 or H7 subtypes were detected, and no clinical signs were observed, suggesting low pathogenicity.
Conclusions:
- The study provides the first evidence of AIV circulation in domestic poultry in Mali.
- Low pathogenic avian influenza is circulating in the Mopti region, potentially linked to wild bird populations.
- Further research is required to monitor AIV temporal dynamics and its relationship with wild bird presence.
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