Current Incidence and Contamination Sources of Ascariasis in Japan

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  • Sugiyama Hiromu
    Laboratory of Helminthology, Department of Parasitology, National Institute of Infectious Diseases
  • Morishima Yasuyuki
    Laboratory of Helminthology, Department of Parasitology, National Institute of Infectious Diseases
  • Kagawa Chisato
    Laboratory of Helminthology, Department of Parasitology, National Institute of Infectious Diseases
  • Araki Jun
    Laboratory of Helminthology, Department of Parasitology, National Institute of Infectious Diseases
  • Iwaki Takashi
    Meguro Parasitological Museum
  • Ikuno Hiroshi
    Department of Bacteriology, BML, Inc.
  • Miguchi Yuji
    Department of Research Development, Civil International Corporation
  • Komatsu Noriyuki
    Department of Research Development, Civil International Corporation
  • Kawakami Yasushi
    Laboratory of Environmental Biology, Department of Environmental Science, Azabu University
  • Asakura Hiroshi
    Division of Biomedical Food Research, National Institute of Health Sciences

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Other Title
  • 日本における回虫症の発生状況および感染源調査
  • Current Incidence and Contamination Sources of Ascariasis in Japan [in Japanese]

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<p>Ascaris lumbricoides or roundworm is one of the key soil-transmitted helminths affecting humans. A small number of infections continue to occur in Japan, suggesting plant foodstuff contamination as the source of infection. To understand the current status of ascariasis incidence and to identify potential sources of infection, we extensively surveyed the available literature and collected data from testing facilities that examined clinical samples or foodstuffs. We observed that from 2002 onwards, there was a decrease in the number of ascariasis cases reported in scientific journals. Data from a clinical testing facility indicated that the number of detected cases declined remarkably from 2009. Foodstuff testing facilities reported that 11 of 10,223 plant foodstuff specimens were contaminated with anisakid nematodes but not with Ascaris. Imported kimchi was suspected as the most probable source of ascarid nematode infection, as one Ascaris egg-positive sample was detected among 60 kimchi samples in a testing facility. Therefore, the sources of Ascaris infection are still not fully known and need to be clarified to establish preventive countermeasures to safeguard Ascaris infections that continue to occur in Japan.</p>

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