The standard recommendation for measles vaccination is two doses of the MMR vaccine (measles, mumps, and rubella).

• The first dose is given to children between 12 and 15 months of age.
• The second dose is given between 4 and 6 years of age, or at least 28 days after the first dose if given earlier.

This two-dose schedule provides about 97% effectiveness in preventing measles

. Additional details include:

• Infants aged 6 to 11 months who are traveling internationally or to areas with measles outbreaks should receive one early dose before travel. However, this early dose does not count toward the routine two-dose series, so they still need the two standard doses after their first birthday

• Adults generally need at least one dose if they lack evidence of immunity, with two doses recommended for certain groups such as healthcare workers, international travelers, and students

• People who have received two doses usually do not need additional boosters, as the vaccine protection is considered to last for life

In summary, for routine childhood immunization, two doses of the MMR vaccine are needed to ensure strong and lasting protection against measles.