To the Editor.— On May 15, 1981, the Centers for Disease Control (CDC) reported an outbreak of measles among the children of migrant farm workers in Texas. Among these were 42 infants younger than 15 months. The CDC and the Office of Migrant Health recommended that "infants ages 6 months through 14 months be vaccinated." 1 In June of this year a message was sent by the CDC to migrant health clinics throughout the country: "Infants, six to 11 months of age, up to first birthday, should receive one dose of single antigen measles vaccine. These infants must be revaccinated at 15 months with trivalent measles, mumps, [and] rubella vaccine to assure continued protection, since some children vaccinated prior to their first birthday will not be effectively immunized." This was a poor recommendation for nationwide distribution. Any physician participating in immunization programs should be aware that immunization against measles at