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INTENSITY, INCIDENCE AND CONVERSION/REVERSION RATIO OF SCHISTOSOMA HAEMATOBIUM INFECTION


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Title: INTENSITY, INCIDENCE AND CONVERSION/REVERSION RATIO OF SCHISTOSOMA HAEMATOBIUM INFECTION
Other Titles: ビルハルツ住血吸虫症の感染の強さ,罹患率と陽転・陰転比
Authors: Shimada, Masaaki / Hirata, Mizuki / Ouma, John H. / Sato, Katsuya / Noda, Shinichi / Aoki, Yoshiki
Authors (alternative): 嶋田, 雅暁 / 平田, 瑞城 / Ouma, John H. / 佐藤, 克之 / 野田, 伸一 / 青木, 克己
Issue Date: 15-Dec-1989
Publisher: 日本熱帯医学会 / Japanese Society of Tropical Medicine
Citation: 日本熱帯医学会雑誌, vol.17(4), pp.285-290; 1989
Abstract: ビルハルツ住血吸虫症の感染の強さ,罹患率,陽転・陰転比の変化を1年半にわたって観察した。感染の強さは2つの指標,尿10ml中の虫卵数と1時間当たりの排泄虫卵数で表した。調査期間中, 6カ月毎に4回尿検査を調査地で行った。すべての調査を受け,かつすべて虫卵陽性であった者を,部落における感染の強さの変化の解析の対象者とした。感染の強さの変化は,用いる指標によって全く異なった。この変化を罹患率,陽転・陰転比で示した感染の圧力の変化,あるいは尿量の変化と比較した。感染の強さを時間当たりの排泄虫卵数で表すと,その変化は罹患率,陽転・陰転比と同様に変化した。この変化は,尿量の変化とは無関係である。一方,尿10ml中の虫卵数で表すと,感染の強さの変化は,感染の圧力とは全く関係せず,尿量とは逆相関した。これらの結果は,調査地でビルハルツ住血吸虫症の感染の強さを表す指標としては,1時間当たりの排泄虫卵数の方が信頼できることを示している。 / The changes in the intensity of Schistosoma haematobium infection, incidence and conversion/reversion ratio in a community were observed over a period of 1.5 years. The intensity of infection was judged by two indices: egg counts per 10 ml of urine and egg counts per hour. During the study period, 4 urine examinations were conducted at 6-month intervals. Subjects were included in the analysis of the changes in the intensity of infection in a community if they took all 4 urine examinations and were positive for eggs. The changes in the intensity of S. haematobium infection differed considerably according to the indices used. The changes in the intensity of infection were compared with the changes in the level of transmission expressed by incidence and conversion/reversion ratio or with the changes in the urine volume. The changes in the intensity of infection expressed by egg counts per hour closely paralleled the changes in both incidence and conversion/reversion ratio in a community, regardless of urine volume. By contrast, when the intensity of infection was expressed by egg counts per 10 ml of urine, it did not correlate with the changes in the level of transmission, and was negatively related to the changes in urine volume. These results suggest that egg counts per hour is a reliable index that accurately reflects the changes in the intensity of S. haematobium infection in a community.
URI: http://hdl.handle.net/10069/22390
ISSN: 03042146
Rights: Japanese Society of Tropical Medicine
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/22390

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