In some countries require you to have the vaccine against yellow fever (for travelers from Africa or Latin America). Other vaccines may request you are hepatitis, typhoid, polio, Japanese encephalitis, rabies and tetanus. It should be borne in mind that health conditions in much of Asia are not good, therefore, beware of mosquitoes and always drink bottled water. Travel insurance that you hire should be covered in the countries you visit, you will not have problems if you get sick.