oral vaccine
A vaccine administered by mouth. This term is rare; the more common expression is 経口ワクチン (けいこうワクチン).
内服ワクチンは、注射を避けたい人に選ばれることがある。
Oral vaccines are sometimes chosen by people who want to avoid injections.
Compound of 内服 (ないふく, 'internal use, oral administration') and ワクチン ('vaccine').