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EPIDEMIOLOGICAL STUDY OF SCHISTOSOMA HAEMATOBIUM INFECTION IN A COASTAL AREA OF KENYA - THE IMPORTANCE OF WATER CONTACT PATTERNS IN RELATION TO S. HAEMATOBIUM INFECTION


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Title: EPIDEMIOLOGICAL STUDY OF SCHISTOSOMA HAEMATOBIUM INFECTION IN A COASTAL AREA OF KENYA - THE IMPORTANCE OF WATER CONTACT PATTERNS IN RELATION TO S. HAEMATOBIUM INFECTION
Other Titles: ケニア,沿岸州におけるビルハルツ住血吸虫症の疫学的研究 ―ビルハルツ住血吸虫感染における水との接触行動の重要性
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.291-301; 1989
Abstract: ヒトと水との接触行動の観察と尿検査(虫卵検査)をケニア,クワレ地区,ムワチンガ村というビルハルツ住血吸虫症流行地で行った。年齢による住民と水との接触量の変化は,住血吸虫症患者の年齢による感染の強さの変化と,全く同じではないがよく似る。そこで感染の強さと水との接触量を,数学モデルを介して,定量的に比較してみた。寄生虫体数,雌雄抱合虫体数,雌雄抱合虫体を有す住民の割合を,水との接触行動観察データ,年罹患率,ビルハルツ住血吸虫成虫の推定生存期間より,虫体の侵入死亡に関する数字モデル, immigration-death model,その他の式を用いて算出した。これらの推定値を,調査地住民の感染率と感染の強さと比較した。その結果,推定値は観察値と直線関係を示した。これらの結果より,我々はピルハルツ住血吸虫症流行地で普遍的にみられる,年齢ー虫卵排泄曲線の特長的型は,単に年齢による住民と水との接触量の変化によって,うまく説明出来ると結論する。 / Water contact observation and urine examination were carried out on a population in an endemic area of Schistosoma haematobium infection, Mwachinga, Kwale district, Kenya. The change in the mean level of water contact with age and the ageprevalence or age-intensity distribution of S. haematobium infection showed similar trends, but not a direct quantitative relationship. Therefore, a mathematical model was applied in the attempt to analyze the relationship between the intensity of S. haematobium infection and the level of water contact. The worm burden, number of paired worms and proportion of hosts with paired worms were estimated from the level of water contact, annual incidence, and the proposed life-span of S. haematobium by using an immigrationdeath model on the basis of simple assumptions. These estimated values were compared with the observed prevalence and intensity of infection. The results showed a linear correlation between observed data and estimated values. We conclude that the characteristic shape of the age-egg output curve for S. haematobium in the community is satisfactorily explained solely in terms of the change in water contact with age.
URI: http://hdl.handle.net/10069/22391
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/10069/22391

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