Abstract
An indirect haemagglutination test has been developed for the detection of strains of Rhizobium trifolii in nodules of subterranean clover plants. Preserved sheep red blood cells, coated with isolated specific rhizobial lipopolysaccharide, were used as the indicator of agglutination; these cells were agglutinated by specific antilipopolysaccharide antibody. Detection of lipopolysaccharide antigen in a suspension of nodular tissue was carried out by reacting the suspension with antilipopolysaccharide antibody prior to the addition of coated red blood cells. The presence of antigen in the suspension was indicated by an inhibition of agglutination. The test was more sensitive than agglutination and immunodiffusion in the detection of rhizobial lipopolysaccharide antigens, and could be used for the rapid screening of large numbers of nodules.
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