Travel vaccinations protect individuals from potentially serious infectious diseases they may encounter while traveling to different regions of the world. Vaccinations can prevent costly medical treatments and hospitalizations that may result from contracting infectious diseases while traveling. Prevention is often more cost-effective than treatment. Some countries require travelers to show proof of vaccination against certain diseases before entering. Travel insurance policies may also require travelers to be vaccinated against specific diseases as a condition of coverage. Having the necessary vaccinations can ensure that your travel insurance remains valid.