Whooping cough was once a terrible menace to U.S. children, with hundreds of thousands of cases reported annually. Then a vaccine drove cases down, and the illness became thought of as rare and even antiquated.
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Whooping cough was once a terrible menace to U.S. children, with hundreds of thousands of cases reported annually. Then a vaccine drove cases down, and the illness became thought of as rare and even antiquated.
Views: 0