erythromycin therapy resulted in the elimination of b. pertussis from the nasopharynx in 2 to 7 days ( mean , 3.6 days ) compared with 7 to 17 or more days ( mean , greater than 12 days ) in patients treated with no antibiotics , but had no effect on the duration or severity of illness as judged by length of hospitalization .
C0014806
erythromycin
C0043167
pertussis