Witthawat WiriyaratHatairat LerdsamranPhisanu PoorukRobert G. WebsterSuda LouisirirotchanakulParntep RatanakornKridsada ChaichouneKannika NateeromPilaipan PuthavathanaMahidol UniversitySt. Jude Children's Research Hospital2018-09-242018-09-242010-12-15Veterinary Microbiology. Vol.146, No.3-4 (2010), 346-349037811352-s2.0-78650306977https://repository.li.mahidol.ac.th/handle/20.500.14594/29152All 16 subtypes of avian influenza viruses of low pathogenicity (LPAIV) as well as their hemagglutinin (H) antigens, and four 2009 pandemic influenza A (H1N1) virus isolates were assayed for hemagglutinating activity against 5 erythrocyte species: goose, guinea pig, human group O, chicken and horse. Of all viruses and antigens assayed, the highest hemagglutination (HA) titers were obtained with goose and guinea pig erythrocytes. Hemagglutinating activity of replicating LPAIV and LPAIV antigens decreased, in order, with chicken and human group O; meanwhile, horse erythrocytes yielded lowest or no HA titer. Moreover, the 2009 pandemic viruses did not agglutinate both horse and chicken erythrocytes. Our study concluded that goose and guinea pig erythrocytes are the best in HA assay for all subtypes of influenza viruses. © 2010 Elsevier B.V.Mahidol UniversityImmunology and MicrobiologyArticleSCOPUS10.1016/j.vetmic.2010.05.031