Antisera were raised against rods of 17 named and strains. Antigenic relationships between these strains, other soil bacteria and new isolates from several soils were studied, using agglutination, immunodiffusion, immunofluorescence and ELISA techniques. Many of the named species had common antigens, and there were also common antigens amongst named strains and many fresh isolates. Agglutination, ELISA and immunofluorescence tests revealed greater antigenic differences between the named strains than did immunodiffusion tests. Serological similarities between the 17 named strains and the fresh isolates were calculated using coefficients. The occurrence of named strains in serogroups based on immunodiffusion data supported the taxonomic scheme for arthrobacters in The distribution of soil isolates in serogroups resembled that in groups based on numerical analysis of diverse characters. This makes it possible to use serological tests to locate particular species in soil samples. was serologically distinct from other members of the group and did not cluster with them phenetically. Serological data suggest that and constitute a single species. Although and have been placed in the genus they are serologically distinct from one another and more closely resemble strains were serologically distinct from arthrobacters. showed many cross-reactions with several antisera, supporting the placement of micrococci in the same family as arthrobacters.


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