Thomas Netzer of the drug and vaccine maker Merck, said that, in turn, could hurt efforts to control dangerous diseases. "In fact, there'd be a real risk, I believe, that diseases that have been controlled in the United States, which used to cause very high morbidity and mortality — and thousands of deaths every year — could once again become common in the United States" Netzer said. "That would not be a good outcome." Full Article at NPR