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Tdap is a booster vaccine for older children, adolescents, and adults. It safely protects against 3 dangerous diseases: tetanus, diphtheria, and whooping cough (also called pertussis).

Pertussis â€“ also known as whooping cough, is a contagious disease that causes violent coughing fits that make it hard to breathe. It spreads easily when someone with the disease coughs or sneezes. The symptoms can last for months. Whooping cough is particularly dangerous for young babies.