Evolution of H5N1 Avian Influenza Viruses in Vietnam (2001-2007)
Author Information
Author(s): Wan Xiu-Feng, Nguyen Tung, Davis C. Todd, Smith Catherine B., Zhao Zi-Ming, Carrel Margaret, Inui Kenjiro, Do Hoa T., Mai Duong T., Jadhao Samadhan, Balish Amanda, Shu Bo, Luo Feng, Emch Michael, Matsuoka Yumiko, Lindstrom Stephen E., Cox Nancy J., Nguyen Cam V., Klimov Alexander, Donis Ruben O.
Primary Institution: Centers for Disease Control and Prevention
Hypothesis
To investigate the emergence, spread, and evolution of H5N1 avian influenza viruses in Vietnam.
Conclusion
The study found that multiple genetically distinct H5N1 viruses were introduced into Vietnam, with evidence of reassortment and the emergence of novel genotypes.
Supporting Evidence
- Over 300 H5N1 avian influenza viruses were isolated from Vietnam since their first detection in 2001.
- Phylogenetic analyses indicated that six genetically distinct H5N1 viruses were introduced into Vietnam.
- At least four of the nine distinct genotypes appear to have originated in Vietnam.
- Geographic and temporal analyses suggest that new viral genes were first detected in northern Vietnam.
Takeaway
Scientists studied bird viruses in Vietnam to see how they changed over time, finding new types of the virus that could be dangerous.
Methodology
The study involved collecting and analyzing samples from poultry across 38 provinces in Vietnam, using RT-PCR and real-time RT-PCR for virus detection.
Limitations
The study's findings are based on samples collected primarily from poultry, which may not fully represent the virus's behavior in other hosts.
Participant Demographics
Samples were collected from poultry farms, backyard flocks, and live bird markets across northern and southern Vietnam.
Digital Object Identifier (DOI)
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