Table. Characteristics of adults with pneumonia and evidence of recent Bordetella pertussis infection.

Characteristic	Definite evidence of recent B. pertussis infection (n = 8)	Possible evidence of recent B. pertussis infection (n = 18)
Median age (range)	68 (37–86)	71 (34–95)
Male:female	4:4	13:5
Current or ex-smokers	6 (75%)	16 (89%)
Median (range) duration of symptoms at admission	8.5 (1–21)	3.5 (1–30)
Presence of cough	8 (100%)	15 (83%)
Sputum production	6 (75%)	7 (39%)
Other respiratory tract pathogens identified	6 (75%)	11 (61%)