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This Feb. 6, 2015, file photo shows a measles, mumps and rubella vaccine on a countertop at a pediatrics clinic in Greenbrae, Calif. The U.S. has counted more measles cases in the first two months of this year than in all of 2017 _ and part of the rising threat is misinformation that makes some parents balk at a crucial vaccine, federal health officials told Congress Wednesday, Feb. 27, 2019 .(AP Photo/Eric Risberg, File)

This Feb. 6, 2015, file photo shows a measles, mumps and rubella vaccine on a countertop at a pediatrics clinic in Greenbrae, Calif. The U.S. has counted more measles cases in the first two months of this year than in all of 2017 _ and part of the rising threat is misinformation that makes some parents balk at a crucial vaccine, federal health officials told Congress Wednesday, Feb. 27, 2019 .(AP Photo/Eric Risberg, File)

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