Executing mass examination for Hieda hamlet, Kama village, Akaiwa county, Okayama pref., results were as follows: 1. Number of people who received the examination; 286 in total, which covers 97.2% of the entire population. 2. There were 12 cases among those examined who have had jaundice in the past; similar to Shakurenii hamlet case, it was also supposed to have experienced certain sporadic cases too, in the past, Among those, 5 cases were rendered to be recoroded, as patients to be included under this head. 3. Patients who complain of conscious pain, 7; they all have had more or less liver disturbances. 4. The liver enlargement has been detected in 62 cases, which amounts to 22.3%, a figure that supersedes that in Shakurenji; splenomegaly was discovered only in 4 cases. 5. No effect has been seen either on pregnancy or delivery. 6. Final decision after the examination; must-be-treated case, 17; must-de-taken-care-of case 23; inapparent infection, 87; total, 127. percentage of contraction, 45.7%. To this, adding 2 mortal cases, attained total 129 cases, which proved 46.3%. 7. Percentage of contraction has proved high with people whose age was above 31; mostly in male, proving an antipodinous contrary to that happened in Shakurenji hamlet. 8. In case those patients exposed would be divided by respective family and investigated, it has been revealed thus. (a) The infection, though differs in degree, was thought sure to permiate all over the place. (b) Among relatives who had chance to take diet with the families which bore mortal cases, percentage of contraction proved to be as high as those families, with many people who are in need of treatment or care-taking. Moreover, a new-comer who had taken the post in a same public residence after the death of the presecessor, has been known to have taken infection immediateelv after. (c) Families which used a well in common with a family certain member of which has been contaminated, gave rise to victims in almost the same rate, which, proved about the same ratio with infected ones who were employing their own well. (c) Among the families which used a well in common with a family which engendered latent hepatiis the infection rather proved higher than those family group which uses their own well. (e) Families using a well in common with other family no member of which has been infected, yielded no patient.
(f) Therefore, in this infected area too the infection due to party-meal, or well has been supposed
