1982 Volume 17 Issue 1 Pages 17-26
The comparison of the cultural, biochemical and serological properties of 286 strains of Streptococcus sp. isolated from streptococcal disease of cultured yellowtail (Seriola quinqueradiata) at various parts of Japan during the period from 1974 to 1980 were investigated.
It was confirmed that these strains have been possessed a very similar characteristics according to the cultural and biochemical tests.
Although some cultural characteristics of Str. sp. are most similar to those of Str. faecalis and Str. faecium, Str. sp. are not react with group D streptococcus antiserum. Therefore, it is necessary to establish the idetification method for Str. sp.
Str. sp. were presumptively identified by bile-esculin medium (growth in 40% bile and hydrolyze esculin), eosin-methylen blue medium (no ferment lactose), a modified NaCl medium by QADRI (nochange color) and the rapid hippurate hydrolysis test by HWANG (negative reaction), and in addition, accurately identified by the slide agglutination using Str. sp. antiserum prepared with Str. sp. KGtype strain.
Besides, Str. sp. could be detected in pur and a high frequency from brain rather than other organs of diseased fish in our own past experience.
