Diagnosis of human and animal brucellosis by the indirect haemagglutination test.

This paper describes the results of many years' study of the indirect haemagglutination (IHA) test for brucellosis. It is shown that the use of sheep erythrocytes sensitized with a specific lipopolysaccharide antigen in the IHA test provides a specific method, which is more sensitive than the agglutination test, for the diagnosis of brucellosis in man and farm animals.