Cambodia, like so many developing countries in Asia, is a breeding ground for a number of unpleasant and sometimes fatal diseases. Malaria, Dengue Fever and HIV, all the variations of Hepatitis, Typhoid and Rabies (and they're just the ones we can spell), most Foreign Embassies will have plenty to say to prospective travellers about staying healthy when travelling around Cambodia. When it comes to your health, all advice is good advice, and playing it safe is definitely recommended.