The crossword solution for the term 'Vaccine Type' is ORAL, which has four letters. An ORAL vaccine is a type of vaccine that is taken by mouth, usually in the form of a pill or liquid. ORAL vaccines are typically used to prevent illnesses such as polio, rotavirus, and typhoid fever. They are also used to protect against certain types of bacterial infections. ORAL vaccines are generally considered to be safe and effective, and they are often preferred over other types of vaccines due to their convenience and ease of administration.