著者

高橋 安雄

出版者

千葉大学

雑誌

千葉医学会雑誌 (ISSN:00093459)

巻号頁・発行日

vol.29, no.4, pp.343-360, 1953-11-28

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Chikazono-village in Nasu-district of Tochigi-prefecture is a pure rural village with 812 houses and 5316 inhabitants (census 1950). Over 70 27777656000f the houses were equipped with Koseisho'privies in 1941-1942. At that time 41 27777670260f the villagers held eggs of parasites (ascaris 30.4 %, ancylostoma 10.8 %). But in recent years, only 17〜18 15332264103f the villagers hold eggs of ascaris and a few ancylostoma. Pupils of elementary and middle schools near the village hold ascaris at the rate of 50〜70 %, whereas the pupils of this village hold the eggs at the rate of only 17〜24 %.0 From this fact it is presumed that the reformed privy is extremely effective for prevention of parasitic worms. Showing the holding rate of ascaris-eggs low, it is a remarkable fact that the eggs are mostly not fertilized. In a microscopic examination of feces, it was found that 32 in 42 pupils of A-class, 6th grade of the elementary school of this village held eggs of ascaris. Pursuing the cause of the sudden rise of the holding rate of ascaris-eggs, the author found out that it was due to a mass-infection during a day-trip of the class. Next the author selected 12 persons and subjected them to the experiment of the infection with ascaris-eggs (50〜200). The ascaris-eggs used in the experiment are as follows. For 1stgroup of subjects : ascaris-eggs separated frme the feces of one of the pupils m ass-infected by the day-trip. For 2nd group : eggs separated from a man holding the eggs for a long time in the village. For 3rd group : eggs of pig-ascaris. On the 2nd group the symptoms are most serious, on 1st group comparatively slighter and on 3rd group slightest. The main feature in symptoms is cough, which is paroximal with difficulty of breathing as asthma, but not attended with sputa. The persons, whose symptoms were serious, had high fever, but the fever lasted only 3 or 4 days and not as long as usual with pneumonia and penicillin was not effective to the fever. The period from the infection to excretion eggs was 65〜7Through the treatment, on each subject of the 2 former groups 30〜92 worms were got out, but on the examples infected with pig-ascaris-eggs, 1 in 3 men got out only one worm.