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A large-scale study was undertaken to clarify the prevalence rate of strongyloidiasis in Okinawa, Japan and to evaluate the relationship between strongyloidiasis and infection with human T cell lymphotropic virus type 1 (HTLV-1). The prevalence rate of Strongyloides stercoralis and HTLV-1 infection were 6.3% and 14.0%, respectively. Among 2,185 patients more than 50 years of age, the rate of S. stercoralis infection was significantly higher in patients with HTLV-1 infection compared with patients without HTLV-1 infection. In 252 patients treated with ivermectin, serum IgE levels and peripheral eosinophil counts were significantly lower in HTLV-1 co-infected patients compared with patients without HTLV-1 infection. In addition, the anthelmintic effect was significantly lower in patients with HTLV-1 infection compared with patients without HTLV-1 infection. Our prospective study demonstrated a prevalence rate for strongyloidiasis and HTLV-1 infections, and clearly demonstrated that co-infection with HTLV-1 impaired the immune response against S. stercoralis.
Received August 4, 2005. Accepted for publication October 9, 2005.
* Address correspondence to Tetsuo Hirata, Control and Prevention of Infectious Diseases, Department of Medicine and Therapeutics, Faculty of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215, Japan. E-mail: h400314{at}med.u-ryukyu.ac.jp
Authors’ addresses: Tetsuo Hirata, Nobufumi Uchima, Akira Hokama, and Jiro Fujita, Control and Prevention of Infectious Diseases, Department of Medicine and Therapeutics, Faculty of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215, Japan, Telephone: 81-98-895-1144, Fax: 81-98-895-1414, E-mails: h400314{at}med.u-ryukyu.ac.jp, nuchima-gi{at}umin.ac.jp, hokama-a{at}med.u-ryukyu.ac.jp, and fujita{at}med.u-ryukyu.ac.jp. Ka-zuto Kishimoto, Nagisa Kinjo, and Fukunori Kinjo, Department of Endoscopy, Ryukyu University Hospital, 207 Uehara, Nishihara, Okinawa 903-0215, Japan, Telephone: 81-98-895-1144, Fax: 81-98-895-1414, E-mails: kk691031{at}yahoo.co.jp, nagisa-k{at}med.u-ryukyu.ac.jp and kinjofuk{at}med.u-ryukyu.ac.jp. Osamu Zaha, Department of Internal Medicine, Nakagami Hospital, 6-25-5 Chibana, Okinawa city, Okinawa, Japan, Telephone: 81-98-939-1300, Fax: 81-98-937-8699, E-mail: zaha-o{at}nakagami.or.jp. Hiroshi Sakugawa, Department of Blood transfusion Medicine, Ryukyu University Hospital, 207 Uehara, Nishihara, Okinawa 903-0215, Japan, Telephone: 81-98-895-1144, Fax: 81-98-895-1414, E-mail: b987607{at}med.u-ryukyu.ac.jp.
Reprint requests: Tetsuo Hirata, Control and Prevention of Infectious Diseases, Department of Medicine and Therapeutics, Faculty of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215, Japan, E-mail: h400314{at}med.u-ryukyu.ac.jp
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