Serological Studies of Swine Erysipelas with Particular Reference to Agglutination

When the results of previous investigations ^ on the agglutination test for swine erysipelas were reported, information was not available as to the time of the appearance and stability of agglutinins in the blood stream of swine following infection. To obtain data on this point, a series of observations and agglutination tests on artificially infected swine was made. Information on the subject also has recently been received from the field. These data are reported in the present paper, together with other experimental data obtained from the agglutination tests of blood serum from swine and from persons who were suspected of being infected with Erysipelothrix rhusiopathiae. A rapid serological method of identifying cultures of E. rhusiopathiae is also reported.