Different areas of the world have different diseases and different prevalence rates of diseases. Travelers going to foreign countries may encounter diseases to which they have no natural immunity and should take any possible precautions.
Review Date 9/24/2019
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.