President Trump's suggestion last week that combination childhood vaccines, including the measles, mumps and rubella, or MMR, shot, should be separated marks a sharp break from decades of immunization practice in the United States.

"I was shocked," said Dr. William Moss, executive director of the International Vaccine Access Center at the Johns Hopkins Bloomberg School of Public Health. "Those vaccines don't even exist in the U.S."

Moss said he hadn't heard such a recommendation "since the Andrew Wakefield days," referring to the former doctor whose 1988 autism study was later retracted as fraudulent .

Investigations revealed Wakefield had undisclosed financial interests in both lawsuits against vaccine manufacturers and a single-measles vaccine patent. His license to practice med

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