The CDC considers you protected from measles if you have written documentation (records) showing at least one of the following:
- You received two doses of measles-containing vaccine, and you are a(n) —
- school-aged child (grades K-12)
- adult who will be in a setting that poses a high risk for measles transmission, including students at post-high school education institutions, healthcare personnel, and international travelers.
- You received one dose of measles-containing vaccine, and you are a(n) —
- preschool-aged child
- adult who will not be in a high-risk setting for measles transmission.
- A laboratory confirmed that you had measles at some point in your life.
- A laboratory confirmed that you are immune to measles.
- You were born before 1957.
For international travelers, CDC considers you protected from measles if you have written documentation (records) showing at least one of the following:
- You received one dose of measles-containing vaccine, and you are an infant aged 6–11 months
- You received two doses of measles-containing vaccine, and you are a person 12 months or older
- A laboratory confirmed that you had measles at some point in your life
- A laboratory confirmed that you are immune to measles
- You were born before 1957
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