title: Ecological cycle of thermostable direct hemolysin-producing strains of Vibrio parahaemolyticus in a brackish-water area with special reference to molluscs and attached microalgae.
abstract: Prevalences of thermostable direct hemolysin (TDH)-producing strains in communities of a gastropod mollusc. Clithon retropictus, and a bivalve mollusc, Corbicula japonica, and levels of the strains in attached microalgae and muddy sediments were investigated at a brackish-water area along Hashizu Creek and Togo Pond in Japan, V. parahaemolyticus was detected from attached microalgae at Hashizu Creek in summer months with the highest level of 1.4 x 10(5) cfu/g. Levels of the organism among 20 animals of C. retropictus and C. japonica at the area varied betwen non-detectable level and 10(3) per mollusc in summer months. TDH was detected from culture supernatants of 11-16% of strains isolated from the algae, sediments and C. japonica and 28% of those isolated from C. retropictus at Hashizu Creek. These evidences suggest that C. retropictus would get TDH-positive strains from the algae.
authors.affiliation: Department of Veterinary Public Health, Faculty of Agriculture, Tottori University, Japan.
authors.forename: N H
authors.initials: NH
authors.lastname: Kumazawa
authors.forename: E
authors.initials: E
authors.lastname: Nakagaki
authors.forename: Y
authors.initials: Y
authors.lastname: Yonekawa
authors.forename: K
authors.initials: K
authors.lastname: Ikura
authors.forename: N
authors.initials: N
authors.lastname: Morimoto
mesh_terms: D000818:Animals; D056890:Eukaryota / Q000502:physiology*; D006460:Hemolysin Proteins / Q000096:biosynthesis*; D008974:Mollusca / Q000382:microbiology*; D012621:Seasons; D012623:Seawater; D014736:Vibrio parahaemolyticus / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D014871:Water Microbiology
chemical_list: D006460:Hemolysin Proteins