Present understanding of inoculations/ tablets required is:
Typhoid, Tetanus, Polio, Diphtheria - are all required.
Malaria - can take Larim tablets but there are documented side effects says Ged. Alternative is course of Chloroquin/ Paludrine tablets.
Rabies - vaccination recommended but can cost £100 depending on GP (cost Stewart £25)
Hepatitis A and B - Twinrix vaccination is available which does both (Hep B cost Stewart £25)
Japanese B Encephalitis - decided to omit due to known side effects.
However this is a personal decision. Visitors are at most risk if they are on a prolonged stay in rural areas during the wet season. October is the generally regarded as the dry season.
There is loads of info on the web