Twenty years ago, we started medical examinations on health care at suburban farming village (TATSUTA village. AICHI Prefecture). There were many differences between suburbanfarmers and other ones. We discussed different points in the results and recognized those causes.
The chief differences in many causes were 1) dietary life 2) labor. We think that the future examinations of farmers' health will have to be changed as are done at hospitals' “human docks” fromon-visit examination.

Surveys on the snail intermediate hosts were undertaken in the paddy fields in Yatomi-cho, Aichi Prefecture, once a year over a 5-year period (1983-1987).
And the cercariae of two different avian schistosomes were detected from snails in paddy fields.
The cercariae from Polyplis haemisphaerula were identified as species beloning to the genus Gigantobilharzia and the cercariae from austropeplea ollula as species belonging to the genus Trichobilharzia.
It was concluded that the paddy field dermatitis occurring in Yatomi-cho was proved to be caused by the invasion of these cercariae.