Recommended Vaccines: Make sure you are up to date with MMR, DPT, polio, and varicella vaccines. Hepatitis A or immune globulin (IG) is also highly recommended, and because hep B is highly prevalent in South Korea, a vaccine is advised. As with Guatemala, typhoid vaccination is also recommended if you will be traveling to rural areas or staying in accommodations where you might be exposed through food or water.
Malaria: Risk is limited to the demilitarized zone and to rural areas in the northern parts of Kyonggi and Kangwon provinces. Chloroquine is the recommended antimalarial drug.
Other Issues: Japanese encephalitis is of some concern, and a vaccine is recommended if you plan to visit rural farming areas or where there has been a known outbreak of Japanese encephalitis.