Publications by authors named "Azusa Umehara"

Anisakid nematodes are known to cause the zoonotic disease, anisakiasis, through the consumption of raw or undercooked fish. The parasites most frequently associated with the disease in humans are categorized as Anisakis type I, which comprise several species of the genus Anisakis. The larvae show primitive forms and lack the detailed morphological characteristics required for precise species identification.

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A multiplex PCR method was established for the rapid identification of Anisakis simplex sensu stricto, A. pegreffii, A. physeteris, Pseudoterranova decipiens, Contracaecum osculatum and Hysterothylacium aduncum.

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Anisakis simplex complex presently comprises three sibling species, A. simplex sensu stricto, A. pegreffii and A.

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Parasites morphologically consistent with Anisakis simplex sensu lato collected from the coast of Japan and Western North Pacific Ocean were examined by PCR-RFLP of the ITS region (ITS1, 5.8 subunit rRNA gene and ITS2) and mtDNA cox1. The RFLP patterns of rDNA generated by HinfI and HhaI showed that 100% of the larvae collected from Hokkaido and 94% of adults collected from Western North Pacific Ocean were identified as A.

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Article Synopsis
  • The weedy sea dragon Phyllopteryx taeniolatus in an aquarium in Kanagawa Prefecture was found to be infected with a protozoan ciliate in 2001, leading to several health issues.
  • Infected fish exhibited symptoms such as sloughing skin, fin damage, skin discoloration, and swelling in the abdomen due to fluid buildup.
  • Histopathological analysis confirmed that the ciliates primarily targeted the dermis, causing severe epidermal detachment, and categorized them within the order Scuticociliatida; the study also explores factors contributing to the mortality of these sea dragons.
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