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Journal of Clinical Microbiology, June 2000, p. 2181-2185, Vol. 38, No. 6
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Frequency of Low-Level Bacteremia in Children from Birth to Fifteen Years of Age

James A. Kellogg,1,* John P. Manzella,2 and David A. Bankert1

Clinical Microbiology Laboratory1 and Division of Infectious Diseases, Department of Medicine,2 York Hospital, York, Pennsylvania

Received 6 December 1999/Returned for modification 13 January 2000/Accepted 16 February 2000

A single blood culture inoculated with a small volume of blood is still frequently being used for the diagnosis of bacteremia in children because of the continued belief by many that bacteria are usually found in high concentrations in the blood of pediatric patients with sepsis. To determine the importance of both blood volume cultured and the number of culture devices required for the reliable detection of pathogens in our pediatric population, blood from children from birth to 15 years of age and with suspected bacteremia at York Hospital (a 500-bed community hospital) was inoculated into at least a Pediatric Isolator (Wampole Laboratories; 1.5 ml of blood) or a standard Isolator (10 ml of blood) and a bottle of ESP anaerobic broth (Trek Diagnostic Systems; 0.5 to 10 ml of blood). The use of a second Isolator and additional aerobic and anaerobic bottles and the total blood volume recommended for cultures (2 to 60 ml) depended on the weight and total blood volume of each patient. One hundred forty-seven pathogens were recovered from the blood of 137 (3.6%) of 3,829 children for whom culturing was done. Of 121 septic episodes for which the concentration of pathogens in the blood could be determined using Isolators, 73 (60.3%) represented low-level bacteremia (<= 10 CFU/ml of blood), including 28 pathogens (23.1%) which were detected at concentrations of only <= 1.0 CFU/ml. Of 144 septic episodes for which two or more culture devices (Isolators and/or bottles) were inoculated, 85 (59%) were associated with false-negative results from one or more of the culture devices. Of the 128 children for whom antibiotic therapy records were complete, therapy was either started or changed for 88 (68.8%) following notification of positive blood cultures. Low-level bacteremia was common in our pediatric population, requiring the culturing of up to 4 or 4.5% of a patient's total blood volume for the reliable detection of pathogens and appropriate, timely changes in empiric therapy.

* Corresponding author. Mailing address: Clinical Microbiology Laboratory, York Hospital, 1001 S. George St., York, PA 17405. Phone: (717) 851-2393. Fax: (717) 851-2707. E-mail: jkellogg{at}yorkhospital.edu.

Journal of Clinical Microbiology, June 2000, p. 2181-2185, Vol. 38, No. 6
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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