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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Long-term outcomes of treatment of Mycobacterium avium complex bacteremia using a clarithromycin-containing regimen.

OBJECTIVES: To describe the long-term outcomes of treatment of AIDS-related Mycobacterium avium complex (MAC) bacteremia using a standard clarithromycin-based regimen. DESIGN: Retrospective study of patients with MAC bacteremia diagnosed between April 1992 and April 1995. SETTING: An urban AIDS clinic SUBJECTS: One hundred seventy-six consecutive patients with MAC bacteremia. INTERVENTIONS: Clarithromycin 500 mg twice daily, ethambutol 800 or 1200 mg daily, and clofazimine 100 mg daily. MAIN OUTCOME MEASURES: Late treatment failure (defined as a positive blood culture more than 90 days after starting treatment), clarithromycin susceptibility of initial and treatment-failure isolates, DNA fingerprinting of isolates from treatment failures. RESULTS: Two out of 176 (1.1%) baseline isolates were resistant to clarithromycin. One hundred and fifty-one patients were treated for MAC bacteremia, 144 (95%) with the standard regimen. Of the 117 patients who survived > 90 days after starting therapy, 25 (21%) met the criteria for late treatment failure. Of the 22 treatment-failure isolates available for susceptibility testing, 19 (86%) were resistant to clarithromycin. Therefore, 13% of patients treated using the standard regimen (19 out of 144) had treatment failure associated with the emergence of clarithromycin resistance. Using logistic regression, non-compliance was associated with treatment failure (P = 0.02). Fourteen out of the 17 (82%) evaluable paired isolates had identical DNA fingerprint patterns, whereas three pairs showed that a different strain of MAC was present at the time of treatment failure. CONCLUSIONS: Initial resistance to clarithromycin was rare during this period. However, late treatment failure associated with the emergence of clarithromycin resistance was relatively common during long-term follow-up. Most late treatment failures represented emergence of clarithromycin resistance in the initial strain.[1]

References

  1. Long-term outcomes of treatment of Mycobacterium avium complex bacteremia using a clarithromycin-containing regimen. Burman, W.J., Stone, B.L., Rietmeijer, C.A., Maslow, J., Cohn, D.L., Reves, R.R. AIDS (1998) [Pubmed]
 
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