Atsushi Suto

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Since 2007, mass mortalities of cultured ascidians Halocynthia roretzi (Drasche) have occurred in Miyagi Prefecture, Japan. The mortalities occur from November through August, and the tunics of affected animals become abnormally weak and soft. The number of farming areas where mass mortalities have occurred has increased rapidly: 3 in 2007, 6 in 2008, and(More)
An 11-year-old castrated Pekinese dog that had been moved from Indonesia to Japan eight years previously was diagnosed with an Ehrlichia canis infection by haematological characteristics (normocytic anaemia, mild thrombocytopenia and hypergammaglobulinaemia) and serological findings (antibody titre to E canis 1:3,200 or more). The dog did not respond to(More)
The fate of calicivirus in oysters in a 10-day depuration was assessed. The norovirus gene was persistently detected from artificially contaminated oysters during the depuration, whereas feline calicivirus in oysters was promptly eliminated. The prolonged observation of norovirus in oysters implies the existence of a selective retention mechanism for(More)
An etiological study was conducted to clarify whether the flagellate-like cells found in histological preparations of the tunic of diseased Halocynthia roretzi (Drasche) were the causative agent of soft tunic syndrome in this ascidian. When pieces of softened diseased tunic were incubated overnight in sterile seawater, live flagellated cells, which were(More)
Azumiobodo hoyamushi, the causative agent of soft tunic syndrome, was likely introduced to farming sites of the edible ascidian Halocynthia roretzi via ascidian spat. The source of infection is thought to be cysts of A. hoyamushi that reside in the substrates on which the ascidian spat are attached, but not the spat themselves. Thus, there is a need to(More)
The contamination of oysters with human noroviruses poses a human health risk, since oysters are often consumed raw. In this study, human norovirus genogroup II was allowed to bio-accumulate in oysters, and then the effect of high-pressure processing (HPP) on human noroviruses in oysters was determined through a polymerase chain reaction (PCR)-based method(More)
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