Avian Influenza Genetic Changes Due to Vaccination
Author Information
Author(s): Escorcia Magdalena, Vázquez Lourdes, Méndez Sara T, Rodríguez-Ropón Andrea, Lucio Eduardo, Nava Gerardo M
Primary Institution: Universidad Nacional Autónoma de México
Hypothesis
How does vaccination pressure affect the genetic evolution of avian influenza viruses in Mexico?
Conclusion
The study found that avian influenza viruses in Mexico are undergoing significant genetic changes due to vaccination pressure.
Supporting Evidence
- The study analyzed AIV strains from 1994 to 2006 to assess genetic changes.
- More than 2 billion vaccine doses have been used in the Mexican avian industry since 1995.
- Recent isolates showed significant molecular drifts compared to the vaccine strain.
Takeaway
Vaccinating chickens against avian flu is causing the virus to change a lot, which might make the vaccine less effective.
Methodology
Phylogenetic analysis of hemagglutinin gene sequences from avian influenza viruses isolated from 2002 to 2006.
Limitations
The study only analyzed a limited number of strains and may not represent all variations of avian influenza.
Participant Demographics
Eighteen avian influenza strains isolated from vaccinated birds in nine regions of Mexico.
Digital Object Identifier (DOI)
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