No abstract

No abstract

No abstract

The antibacterial activities of 19 chemotherapeutic agents were tested against 370 strains of a non-hemolytic Streptococcus sp. pathogenic for a marine fish, the yellowtail Seriola quinqueradiata.The strains were isolated from cultured yellowtail in 1986 and 1987. Sixty-two of the tested strains showed resistance to macrolide antibiotics (MLs), lincomycin (LIM), tetracycline (TC), and chloramphenicol (CP). These resistant strains were classified into intermediate-and high-level resistance to MLs, LIM, TC, or CP. Intermediate-level resistance was constitutive and the responsible resistance determinants were not transferred to S, faecalis JH2-2 or to Streptococcus sp. SSS-1, the latter a yellowtail isolate. On the other hand, hgh-level resistance to MLs, LIM, and TC and to MLs, LIM, and CP was inducible and transferable to S. faecalis JH2-2 and to Streptococcus sp. SSS-1. These drugresistant strains of the non-hemolytic Streptococcus sp., capable of transferring their resistance, were first isolated in cultured yellowtail in various areas of Japan.

Eimeria gruis and E. reichenowi have lethal pathogenicity to a number of species of cranes. These parasites develop at multiple organs or tissues in infected cranes, thus lacking the specificity of infection sites shown by other Eimeria spp. in spite of morphologic similarity. To date, there have been many reports of crane Eimeria infections, however, genetic examinations of these parasites have never been published. In the present study, we isolated oocysts of E. gruis and E. reichenowi from crane feces at a wintering area in Japan. By phylogenic analysis, we first demonstrated that partial sequences of the isolates formed their own cluster, located separately from other Eimeria spp.