Hepatitis A and B vaccines (three shots over six months, $80-200) provide protection for at least 15 years. Mosquito-borne malaria is prevented by daily pills such as Doxycycline and Malarone ($60-150). Contaminated food and drink could cause typhoid fever; a shot ($70-120) or live, oral vaccine ($50) helps stave off this infection. To avoid being vaccinated at the border (or possible quarantine) check entry requirements before departure and carry proof of vaccination. If you shouldn't get a vaccine for health reasons, be sure to carry a doctor's signed waiver. The Centers for Disease and Control Prevention has a very helpful information for travelers in all parts of the world. It will be very helpful for you since your destination is not in just one continent.