title: Influenzavirus neuraminidase and neuraminidase-inhibition test procedures.
abstract: The adequate characterization of type A influenzaviruses requires the identification not only of the haemagglutinin but also of the neuraminidase. The neuraminidase-inhibition test, as performed in the two WHO international reference centres for influenza, is described and its use in other laboratories-particularly those collaborating in the WHO programme-is recommended.
mesh_terms: D000956:Antigens, Viral; D006385:Hemagglutination Inhibition Tests; D008722:Methods; D009439:Neuraminidase / Q000032:analysis / Q000037:antagonists & inhibitors*; D009975:Orthomyxoviridae / Q000201:enzymology* / Q000276:immunology
chemical_list: D000956:Antigens, Viral; D009439:Neuraminidase