Kalayanee KhupulsupNitaya PoopyruchpongBencha PetchclaiKavi RatanabanangkoonFaculty of Medicine, Ramathibodi Hospital, Mahidol UniversityMahidol University2018-10-122018-10-121981-01-01Toxicon. Vol.19, No.6 (1981), 863-866004101012-s2.0-0019838264https://repository.li.mahidol.ac.th/handle/123456789/30270A passive hemagglutination test for the semiquantitative determination of antibody to Naja naja siamensis toxin 3 was developed. The assay involved a one-step coupling of the toxin to sheep erythrocyte. The toxin-coupled erythrocyte was stable for at least 4 months at 4°C and upon incubations with various elapid venoms there was no detectable hemolysis. The hemagglutination of the coupled sheep erythrocyte was specific, as shown by inhibition tests with various snake venoms. An application of the hemagglutination test in monitoring antibody production by rabbits during a course of immunization was studied. © 1981.Mahidol UniversityPharmacology, Toxicology and PharmaceuticsArticleSCOPUS10.1016/0041-0101(81)90083-0