Increased Detection Rate of Strongyloides stercoralis by Repeated Stool Examinations Using the Agar Plate Culture Method

Tetsuo Hirata Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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Hiroshi Nakamura Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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Nagisa Kinjo Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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Akira Hokama Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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Fukunori Kinjo Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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Nobuhisa Yamane Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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Jiro Fujita Department of Medicine and Therapeutics, Control and Prevention of Infectious Diseases, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan; Department of Clinical Laboratories, Ryukyu University Hospital, Okinawa, Japan; Department of Endoscopy, Ryukyu University Hospital, Okinawa, Japan

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To clarify the efficacy of repeated stool examinations by the agar plate culture method for the detection of Strongyloides stercoralis infection, 4,071 stool samples collected from 2,406 patients > 50 years of age in Ryukyu University Hospital were examined. The cumulative detection rate of S. stercoralis infection was 4.7% (112/2,406). At the first, second, third, and beyond fourth examinations, the detection rates were 3.6% (86/2,406), 1.5% (12/786), 2.6% (10/392), and 2.0% (4/198), respectively. From these results, the cumulative detection rate was estimated to be 7.4% when three stool samples were examined for all patients. Our study showed that repeated stool examinations increase the sensitivity of detection of S. stercoralis infection.

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