Silverleaf and DoctorMichael have,IMO,given you good advice regarding health issues but there's one thing that hasn't been mentioned regarding malaria prophylaxis...
IIRC (it's been a while since I've been to Africa),you must start the malaria pills some time before you leave home...I think it might even be a month or more.Given this fact (possibility?) it would be wise to get your marching orders from the doctor that you consult long before you plan to leave.
Also, get a fresh Tetanus shot. Don't get bit by any animals (Bats, etc.): Rabies is endemic. Tanzania would not let you exit the airport after you arrived unless you could show an up-to-date Yellow Fever shot. I've also had both Hepatitus A & B, Meningiococcal and Typhoid vaccinations as well as getting booster shots for all the childhood diseases that you got as a kid years ago. See here................
http://www.cdc.gov/travel/eafrica.htm