Abstract
From dirty water in sewrage and stool of animals we isolated 5 strains of bacteriophages parasitic on L. casei group B, 7 strains on L. casei group C and 4 strains on L. plantarum
Bacteriophages parasitic on L. casei B were morphologically different from those parasitic on L. casei C: The former didn't have sheath on the tail while the latter had a contractile one. The morphological structure of the bacteriophages parasitic on L. plantarum was approximately similar to that of the bacteriophages parasitic on L. casei B.
Of the total of 12 strains of bacteriophages parasitic on L. casei, 5 strains parasitic on group B showed almost the sams serological pattern, however, the remaining 7 strains parasitic on L. casei group C were separated into two groups according to their serological patterns. Moreover all the 4 strains parasitic on L. plantarum were proved to belong to the same type in this sense. No serological relationship was found among the groups of bacteriophages parasitic on different types of the host bacilli.
A further study was done regarding the possibility in typing the host bacilli, L. casei, according to adsorption of bacteriophages. This classification based on bacteriophages corresponded to that by serological reactions.
