Changes in the Prevalence of Intestinal Parasites among Japanese Expatriates in Developing Countries

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  • HAMADA Atsuo
    Japan Overseas Health Administration Center, Labor Welfare Corporation
  • OKUZAWA Eiichi
    Japan Overseas Health Administration Center, Labor Welfare Corporation
  • UJITA Yuka
    Japan Overseas Health Administration Center, Labor Welfare Corporation
  • HONDO Kiyomi
    Japan Overseas Health Administration Center, Labor Welfare Corporation
  • OHKUBO Norihiko
    Japan Overseas Medical Found
  • NISHIKAWA Tetsuo
    Japan Overseas Health Administration Center, Labor Welfare Corporation
  • BASUGI Norihiko
    Japan Overseas Health Administration Center, Labor Welfare Corporation

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Other Title
  • 発展途上国に長期滞在する日本人の腸管寄生虫感染状況の変化
  • ハッテン トジョウコク ニ チョウキ タイザイ スル ニホンジン ノ チョウカン キセイチュウ カンセン ジョウキョウ ノ ヘンカ

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Abstract

In order to study the prevalence of intestinal parasites among Japanese expatriates of developing countries, we conducted fecal specimen examinations annually from 1995 to 2000. Fecal specimens were collected from Japanese expatriates of each area: Asia, the Middle East, East Europe, Africa and Latin America. The specimens were fixed with 10% formalin in the local area, and then examined in Japan. We used the formalin-ether sedimentation method to find protozoan cysts or helminth eggs.<BR>In 1995, the infection ratio was 3.0% (N=981), decreasing to 2.4% (N=1, 275) in 1996, 2.3% (N=1, 620) in 1997 and 1.6% (N=1, 574) in 1998. However, the ratio began to increase in 1999 (2.0%, N=1, 713) and 2000 (2.5%, N=1, 806). The ratio in Africa was the highest in each year, followed by Asia and Latin America. Heterophyidae (51 cases), Giardia lamblia (42) and Trichuris trichiura (30) were detected most frequently. In Egypt, the ratio of Heterophyidae rose by 28.8% in 2000. This was the prime reason for the increase in the overall ratio of infections worldwide. Most of the Japanese infected with Heterophyidae in Egypt had ingested dried mullet roe. This may explain the reason for the increase in the infection ratio there.<BR>Although the prevalence of intestinal parasites among Japanese expatriates in developing countries is decreasing, those who eat fish in these areas are still at risk. In order to eradicate intestinal parasitosis from this group, we must continue preventive measures such as health education.

Journal

  • Kansenshogaku Zasshi

    Kansenshogaku Zasshi 77 (3), 138-145, 2003

    The Japanese Association for Infectious Diseases

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