Abstract
Mass examinations of the skin test of yato-byo in four towns and villages in Miyagi Prefecture were undertaken from February of 1955 to April of 1956 and following results were confirmed.
1. The positivity rate of the skin test is high in the intermountain districts but low in the seaside districts.
2. The positivity rate is higher in the male than in the female.
3. No association is found between the positivity rate and occupations.
4. The positivity rate increases in proportion to the increase in age. However, correlation between the skin test and age is relatively slight.
5. There is no correlation between the tuberculin skin test and the skin test of yato-byo.
