also: ひゃくにちせき
whooping cough; pertussis
Medical term for the bacterial respiratory infection characterized by severe coughing fits. Both ひゃくにちぜき and ひゃくにちせき are used, with ひゃくにちぜき being more common.
Whooping cough is a particularly dangerous infectious disease for infants.
Did you get vaccinated against pertussis?