In Nha Trang, the Institute of vaccine Research is producing safe vaccines for the country's most common diseases, including tuberculosis, tetanus and diphtheria, among others.

Objective: to observe clinical reactions and immune responses of combined vaccinations of mumps and hepatitis a, rubella vaccine, diphtheria-tetanus toxoids respectively.

And not all vaccines offer long term protection. The tetanus vaccine is a good example. It offers protection for only about ten years. Then a person must be immunized again.