2. A short, dry cough.
3. Repeated short coughs.
It is caused by the bacteria Bordetella pertussis. The illness is most likely to affect young children, but sometimes appears in teenagers and adults, even those who have been previously immunized.
Immunization with DPT (diphtheria-pertussis-tetanus) vaccine provides protection, although that immunity may wear off with age.
When teenagers and adults get pertussis, it appears first as coughing spasms, and then a stubborn dry cough lasting up to eight weeks.
2. A thrill felt by the hand when applied to the chest of a person coughing.
It most often occurs in heavy-set male smokers who have chronic bronchitis.