Giuseppe
Emeritus
Impact of antigenic and genetic drift on the serologic surveillance of H5N2 avian influenza viruses (BioMedCentral, Abstract, edited)
[Source: BioMedCentral, full text: <cite cite="http://www.biomedcentral.com/1746-6148/6/57/abstract">Abstract | Impact of antigenic and genetic drift on the serologic surveillance of H5N2 avian influenza viruses</cite>. Abstract, edited.]
Impact of antigenic and genetic drift on the serologic surveillance of H5N2 avian influenza viruses
Magdalena Escorcia, Karol Carrillo-Sanchez, Santiago March-Mifsut, Joaquin Chapa, Eduardo Lucio and Gerardo M. Nava
BMC Veterinary Research 2010, 6:57
doi:10.1186/1746-6148-6-57
Published: 20 December 2010
Abstract (provisional)
Background
Serologic surveillance of Avian Influenza (AI) viruses is carried out by the hemagglutination inhibition (HI) test using reference reagents. This method is recommended by animal health organizations as a standard test to detect antigenic differences (subtypes) between circulating influenza virus, vaccine- and/or reference- strains. However, significant discrepancies between reference antisera and field isolates have been observed during serosurveillance of influenza A viruses in pig and poultry farms. The objective of this study was to examine the effects of influenza virus genetic and antigenic drift on serologic testing using standard HI assays and reference reagents. Low pathogenic AI H5N2 viruses isolated in Mexico between 1994 and 2008 were used for phylogenetic analysis of AI hemagglutinin genes and for serologic testing using antisera produced with year-specific AI virus isolates.
Results
Phylogenetic analysis revealed significant divergence between early LPAI H5N2 viruses (1994 - 1998) and more recent virus filed isolates (2002 - 2008). Results of the HI test were markedly influenced by the selection of the AI H5N2 virus (year of isolation) used as reference antigen for the test. These analyses indicate that LPAI H5N2 viruses in Mexico are constantly undergoing genetic drift and that serosurveillance of AI viruses is significantly influenced by the antigen or antisera used for the HI test.
Conclusions
Reference viral antigens and/or antisera need to be replaced constantly during surveillance of AI viruses to keep pace with the AI antigenic drift. This strategy should improve the estimation of antigenic differences between circulating AI viruses and the selection of suitable vaccine strains.
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[Source: BioMedCentral, full text: <cite cite="http://www.biomedcentral.com/1746-6148/6/57/abstract">Abstract | Impact of antigenic and genetic drift on the serologic surveillance of H5N2 avian influenza viruses</cite>. Abstract, edited.]
Impact of antigenic and genetic drift on the serologic surveillance of H5N2 avian influenza viruses
Magdalena Escorcia, Karol Carrillo-Sanchez, Santiago March-Mifsut, Joaquin Chapa, Eduardo Lucio and Gerardo M. Nava
BMC Veterinary Research 2010, 6:57
doi:10.1186/1746-6148-6-57
Published: 20 December 2010
Abstract (provisional)
Background
Serologic surveillance of Avian Influenza (AI) viruses is carried out by the hemagglutination inhibition (HI) test using reference reagents. This method is recommended by animal health organizations as a standard test to detect antigenic differences (subtypes) between circulating influenza virus, vaccine- and/or reference- strains. However, significant discrepancies between reference antisera and field isolates have been observed during serosurveillance of influenza A viruses in pig and poultry farms. The objective of this study was to examine the effects of influenza virus genetic and antigenic drift on serologic testing using standard HI assays and reference reagents. Low pathogenic AI H5N2 viruses isolated in Mexico between 1994 and 2008 were used for phylogenetic analysis of AI hemagglutinin genes and for serologic testing using antisera produced with year-specific AI virus isolates.
Results
Phylogenetic analysis revealed significant divergence between early LPAI H5N2 viruses (1994 - 1998) and more recent virus filed isolates (2002 - 2008). Results of the HI test were markedly influenced by the selection of the AI H5N2 virus (year of isolation) used as reference antigen for the test. These analyses indicate that LPAI H5N2 viruses in Mexico are constantly undergoing genetic drift and that serosurveillance of AI viruses is significantly influenced by the antigen or antisera used for the HI test.
Conclusions
Reference viral antigens and/or antisera need to be replaced constantly during surveillance of AI viruses to keep pace with the AI antigenic drift. This strategy should improve the estimation of antigenic differences between circulating AI viruses and the selection of suitable vaccine strains.
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