The only vaccine required by International Health Regulations is yellow fever vaccination for travel to certain countries in sub-Saharan Africa and tropical South America. Meningococcal vaccination is required by the government of Saudi Arabia for annual travel during the Hajj. For information on the specific countries that require malaria prevention, yellow fever, meningococcal or other vaccines, + visit the Traveler's Health website.
These immunizations are recommended for missionaries, but not required unless specified in the pdf document:
Pneumonia: Senior missionaries over age 65 or those with heart or lung disease, diabetes, sickle cell disease, or other immune challenged conditions should receive this vaccine.
Meningitis: All young adult missionaries should receive meningococcal meningitis vaccine. In some areas this vaccine is required. This vaccine is not approved for those over age 65 years.
Chickenpox: If a missionary has no history of the disease or has not received the vaccine, a total of two doses, each one month apart, is advised.
Shingles (Herpes Zoster): Senior missionaries over age 50 may reduce the risk of shingles and neuralgia with a single dose of this live virus vaccine (Zostavex).
Additional immunizations and malaria prevention are required for missionaries serving in countries identified in the pdf document. Those countries not listed require the basic immunizations as specified on the previous page.