To identify the strain of influenza virus type a.A separate strain of the influenza virus exploits the principle of serology to identify differences in the surface layer glycoprotein shell of a virus haemagglutinin (HA), neuraminidase (NA) and the current can be divided in 16 haemagglutinin and neuraminidase type can be specified as type 9 strain of virus, it must identify both types of haemagglutinin and neuraminidase components.
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