Antigenic alterations occur frequently in the antigenic sites of HA and NA and are the mechanism for virus adaptation and survival. To date, 16 HA, and 9 NA subtypes have been detected in wild birds and poultry Footnote 5- Footnote 9. Type A influenza viruses are subdivided on the basis of the antigenic nature of their membrane-bound surface glycoproteins, haemagglutinin (HA) and neuraminidase (NA). SYNONYM OR CROSS REFERENCE: Orthomyxovirus Footnote 1- Footnote 3, influenza virus type A Footnote 1- Footnote 3, influenzavirus A Footnote 1- Footnote 3, avian influenza Footnote 1- Footnote 3, and pandemic influenza Footnote 4.ĬHARACTERISTICS: Influenza virus subtypes H5, H7 and H9 are members of the Orthomyxoviridae family of segmented, negative sense single-stranded RNA viruses. NAME: Influenza A virus subtypes H5, H7 and H9. PATHOGEN SAFETY DATA SHEET - INFECTIOUS SUBSTANCES SECTION I - INFECTIOUS AGENT
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