Bacteremia Due to Achromobacter xylosoxidans in Patients with Cancer

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Abstract
Bacteremia due to Achromobacter xylosoxidans is rare, and little information on treatment is available. Between 1983 and 1988, A. xylosoxidans was recovered from 26 cultures of blood from 10 patients with cancer and clinical signs of infection, including one patient with septic shock and two with pneumonia. Neutropenia did not seem to be a predisposing factor. The infection may have been catheter related in four patients and associated with gastrointestinal pathology in four others. Probable cause was not determined in the remaining two. In vitro studies of susceptibility showed that the isolates were susceptible to trimethoprim-sulfamethoxazole (TMP-SMZ), the antipseudomonal penicillins, ceftazidime, cefoperazone, and imipenem; moderately susceptible to ciprofloxacin; and resistant to ceftriaxone, cefotaxime, cefoxitin, ceftizoxime, aztreonam, and amikacin. All patients receiving therapy recovered, including those six who received TMP-SMZ or a β-lactam antibiotic as a single agent. A. xylosoxidans bacteremia is a significant infection and may be catheter related or associated with gastrointestinal pathology. The infection usually responds to therapy with TMP-SMZ or an appropriate β-lactam antibiotic.

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