NEW YORK, Mar 11: Protection against whooping cough starts to weaken a few years after preschool children get their final diphtheria, tetanus and pertussis (DTaP) shot, a new study confirms. The Centers for Disease Control and Prevention (CDC) recommends a booster shot at age 11 or 12. But researchers found that slightly younger kids may be at risk of developing whooping cough before then, as their original immunity declines. (agencies)
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