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Nationally, vaccination coverage fell slightly below 94 percent for the measles, mumps and rubella vaccine; the diphtheria, tetanus and acellular pertussis vaccine; and for the varicella vaccine, the C.D.C. said.

Minnesota health officials reminded expecting mothers to receive the tetanus, diphtheria and acellular pertussis, or Tdap, vaccine during their third trimester.

Similarly, acellular slime molds—strange, gelatinous organisms that consist of a single cell with billions of nuclei—lack a brain yet sometimes act like far more sophisticated creatures.

Slifka says the replacement of the whole cellular vaccine with the acellular one was unnecessary and a mistake.

So officials switched to the current acellular vaccine, which has fewer side effects but does not provide immunity for as long.