1975 年 50 巻 4-5 号 p. 115-121
Introduced herewith is a new type of PPD which we have developed lately as a single dose preparation. Although the need for this type of PPD has been talked about frequently for years, the product has neither been materialized nor marketed due to difficulties in its production such as the persistent absorption of PPD protein inside its container and so forth, and the difficulty becomes more serious when the product is intended for smaller number of doses to require a miniature sized container.