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The Vaccines for Children program, which serves nearly half the nation’s youths, had been in limbo for almost a month, with doctors unable to obtain the shots.
Some viruses appear to vanish when outbreaks dissipate, only to emerge again. Scientists don’t always know which animals they lurk in — and how to stop them from spilling back over.
Four are dead in Pennsylvania’s measles outbreak. But the C.D.C. isn’t yet convinced.
Missouri health officials warned on Monday about a possible measles exposure at Busch Stadium and nearby local businesses in St. Louis and the larger county.