title: Efficacy and safety of clarithromycin versus erythromycin for the treatment of pertussis: a prospective, randomized, single blind trial.
abstract: BACKGROUND
  Pertussis is still a prevalent public health problem, and antibiotic therapy may decrease disease severity and limit communicability. Erythromycin is the recommended antibiotic for treatment and prophylaxis of pertussis; however, side effects of erythromycin limit its usefulness in some patients. Clarithromycin, a newer macrolide, has good in vitro activity against Bordetella pertussis and a better side effect profile.
  
  
  OBJECTIVE
  To compare the microbiologic and clinical efficacy and the clinical safety of a 7-day course of clarithromycin vs. a 14-day course of erythromycin in children with pertussis.
  
  
  METHODS
  Prospective, randomized, single blind (investigator), parallel group trial.
  
  
  METHODS
  Children from 1 month to 16 years of age presenting with a clinically defined pertussis syndrome were eligible for the study. After obtaining informed written consent, we randomized patients to receive either clarithromycin (7.5 mg/kg/dose twice a day for 7 days) or erythromycin (13.3 mg/kg/dose three times a day for 14 days). Nasopharyngeal cultures for B. pertussis were performed at enrollment and after end of treatment. Clinical assessments were performed at enrollment, at end of treatment and at a 1-month follow-up visit. Adverse event data were collected throughout the study.
  
  
  RESULTS
  The clarithromycin (n = 76) and erythromycin (n = 77) groups were well-matched for age and previous pertussis immunization. Microbiologic eradication and clinical cure rates were 100% (31 of 31) for clarithromycin and 96% (22 of 23) for erythromycin. The clarithromycin group had significantly fewer adverse events [45% (34 of 76) for clarithromycin vs. 62% (48 of 77) for erythromycin; P = 0.035], and compliance with the medication regimen was significantly higher in these patients.
  
  
  CONCLUSIONS
  A 7-day regimen of clarithromycin and a 14-day course of erythromycin were equally effective for treatment of pertussis. Clarithromycin was better tolerated than conventional erythromycin therapy.
authors.affiliation: Hôpital Sainte-Justine, University of Montreal, Montreal, Canada. Marc_Lebel@SSSS.gouv.qc.ca
authors.forename: M H
authors.initials: MH
authors.lastname: Lebel
authors.forename: S
authors.initials: S
authors.lastname: Mehra
mesh_terms: D000900:Anti-Bacterial Agents / Q000009:adverse effects / Q000627:therapeutic use*; D001886:Bordetella pertussis / Q000187:drug effects*; D002648:Child; D002675:Child, Preschool; D017291:Clarithromycin / Q000009:adverse effects / Q000627:therapeutic use*; D004917:Erythromycin / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D011446:Prospective Studies; D016037:Single-Blind Method; D016896:Treatment Outcome; D014917:Whooping Cough / Q000188:drug therapy* / Q000382:microbiology
chemical_list: D000900:Anti-Bacterial Agents; D004917:Erythromycin; D017291:Clarithromycin