EN
Two hundred and fifteen rabbit sera have been assessed by the haemagglutination inhibition test for the presence of antibodies against lagomorphs disease virus. Sera were inactivated at 57—58°C for 30 minutes and the haemagglutination inhibition test was performed with human erythrocytes of group 0 (Rh +). The erythrocyte suspension was prepared in Sörensen’s buffer, pH 5.8, containing 0.1 per cent of human serum albumin. The presence of the antibodies was revealed in 31.6 per cent sera; their titers ranged from 10 to 6400 units.