Bali is much more developed than most regions in Indonesia and the risk of contracting many tropical diseases is small. The West’s version of the Flu vaccine is aimed at a different strain and won’t really work on the Asian Flu virus, however, it could be wise to have regardless. In addition, you should be wary of mosquito’s and plan your vaccine strategy 4-8 weeks before scheduled departure. All natural mossie spray is available in abundance in Bali.
The generally recommend vaccinations for Bali for the standard Tourist include cover against Measles, Mumps, Rubella Hepatitis A, Typhoid, Tetanus and Polio.
Travelers planning a more rural or extensive trip may need to consider taking cover against rare diseases like Hepatitis B, Japanese B Encephalitis, Rabies.