How are Enterobacter infections diagnosed?

Updated: Jun 18, 2019
  • Author: Susan L Fraser, MD; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Two sets (with one aerobic and one anaerobic bottle in each set) should be obtained 20-30 minutes apart, from 2 different sites (if possible). If the patient has a central venous catheter, one set should be drawn through it. In the adult patient, 8-10 mL of blood should be collected in each bottle. Enterobacteriaceae ferment glucose and should thus grow in both bottles.

Growth in the presence and absence of oxygen is very important early information permitting a presumptive diagnosis of Enterobacteriaceae bacteremia because nonfermentative gram-negative bacilli (eg, Pseudomonas, Acinetobacter, Stenotrophomonas) cannot usually grow in the absence of oxygen.


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