People entering the U.S. as visitors are not required to provide proof of vaccination regardless of the length of stay. See 'Ask the Experts' for more information.
Polio, Avian Influenza, etc. from the Centers for Disease Control and Prevention Travel website.
Measles
All Travelers 6 Months of Age and Older Should Be Protected from Measles.
Infants 6 through 11 months of age should receive one dose of MMR vaccine before departure.
All other children 12 months of age and older, teenagers, and adults born after 1957 should have a documented record of 2 doses of MMR vaccine separated by at least 28 days or other evidence of immunity to measles as listed below.
Evidence of Measles Immunity for International travelers consists of one of the following:
Birth before 1957.
Documented administration of 2 doses of live measles virus vaccine (MMR, MMRV, or measles vaccines).
Laboratory (serologic) proof of immunity.
Documentation of physician-diagnosed measles.
Yellow Fever
This section provides information about Yellow Fever and how to become a Yellow Fever Provider.
What is Yellow Fever?
Yellow fever is a disease caused by a virus that is spread through mosquito bites. Symptoms take 3–6 days to develop and include fever, chills, headache, backache, and muscle aches. About 15% of people who get yellow fever develop serious illness that can lead to bleeding, shock, organ failure, and sometimes death.