CDC's global measles notice turns the summer trip into a calendar problem. All international travelers should be fully vaccinated, infants 6 to 11 months should receive an early MMR dose, and anyone 12 months or older without evidence of immunity needs two doses at least 28 days apart. [1]

The paper's July 1 warning that domestic measles gaps were colliding with record travel now has an itinerary attached. CDC tells travelers to schedule a clinician visit at least six weeks before departure if they are unsure, because full protection can require two doses. [1]

The service point is plainer than the politics. CDC's travel page says vaccination should happen at least two weeks before international travel, but a traveler less than two weeks out should still get a dose if unprotected. Two doses protect 97 percent against measles; one dose protects 93 percent. [2] Children over 12 months and adults without evidence of immunity are told to begin immediately. [2]

MSM maps outbreaks. X fights vaccines. The gap is what parents and travelers do before school starts and after planes land. CDC says travelers should watch their health for three weeks after return and call ahead before visiting a clinic if rash and fever appear. [2]

-- NORA WHITFIELD, Chicago