Some health experts said young people traveling to countries where the level of hygiene isn't so high, or people eating imported foods contaminated with the virus could be the cause of the prevalence of the disease.
The KDCD advised people traveling to Southeast Asian countries and Africa to have vaccinations, which is the only effective way to prevent it.
Also, the government advised people to wash their hands more often, drink boiled water or ``safe'' water as well as to cook food.
Well, yes, increased travel could be one reason. Perhaps the Korean aversion to handwashing, soap, and flushing toilet paper could be some others.