thirty-two ( 29.4 % ) of 109 patients with cf had a titer of 1:256 or higher , the level presumptive of previous infection , compared with ( 1 ) three ( 11.5 % ) of 26 patients without cf but with chronic suppurative bronchitis of childhood , ( 2 ) three ( 1.7 % ) of 178 age-matched persons without pulmonary disease , ( 3 ) zero of 22 parents and normal siblings , and ( 4 ) zero of 113 adult patients with chronic pulmonary diseases .
C0024115
pulmonary disease
C0746102
chronic