From 1957 to 1958, seven salmonelle-like organisms were isolated from the lymph node of sacrificed guinea pigs, and the other one was isolated from the heart blood of a dead guinea pig.
On the basis of our antigenic study, four strains were identified as Salmonella give, two as Salmom potsdam and the remaining two as Citrobacter.
Guinea pigs and mice were examined for their vulnerability to these organisms, especially Citrobacter (strain 212) being studied in detail. It was confirmed that the experimental reproduction of the infection succeeded in mice and guinea pigs with the strain 212 but not in rabbit. In the case of mice infected with strain 212, carrier statecontinued approximately seventy days after infection.
In this connection, attention should be given on such quiescent infectious disease from the viewpoint not only of the experimental infection but also of the laboratory animal care.

View full abstract