hemagglutinin typing URL:http://www.springerprotocols.com/Full/doi/10.1007/978-1-59745-279-3_8?encCode=REZJOjhfMy05NzItNTQ3OTUtMS04Nzk=&tokenString=ycLy0AkcLqNgMccOI6y30w== An assay which aims at determining the hemagglutanin subtype of an influenza virus. HA typing MC, 20101202: made it a defined class as there are several methods to identify the heagglutinin type as per http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T32-4C47KNC-5&_user=1022551&_coverDate=07%2F31%2F2004&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1565330571&_rerunOrigin=google&_acct=C000050484&_version=1&_urlVersion=0&_userid=1022551&md5=c5d1a3bc08abe655acb70076b13e3a74&searchtype=a The haemagglutination-inhibition assay that is routinely used for subtyping and antigenic characterisation of influenza strains does not distinguish between A(H1N1) and A(H1N2) strains; therefore, alternative tests are required for typing the NA. The standard test used to determine neuraminidase type is a rather cumbersome and time-consuming procedure (approximately 18 h) which relies on inhibition, by antibody, of n-acetyl neuraminic acid release from a substrate such as fetuin (Aymard-Henry et al., 1973). Alternative methods of neuraminidase assay have been described, one for example relying on the agglutination of neuraminidase-treated erythrocytes by lectins (Fiszon and Hannoun, 1990 B Fiszon and C Hannoun, Comparison of neuraminidases of the same subtype but from different species using a new method of titration, J. Virol. Methods 27 (1990), pp. 79–90. Abstract | PDF (587 K) | View Record in Scopus | Cited By in Scopus (4)Fiszon and Hannoun, 1990) hemagglutinin