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'Vaccines are safe, effective and life-saving'

'Vaccines are safe, effective and life-saving'

In the 1930s, outbreaks swept through every corner of Baltimore. Tens of thousands of children grew sick with fever and a tale-tell rash. Many recovered without incident, but hundreds were killed, and many more were permanently injured with brain damage and hearing and vision loss. The illness came and went, seemingly at random. Families lived with uncertainty and fear, not knowing when illness and tragedy would strike. One day, a scientist recognized a pattern. He found that the outbreaks occurred at times when most children in Baltimore had not experienced measles and were therefore susceptible to the infection. He correctly reasoned that when enough children were immune to measles by...