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Journal of Clinical Microbiology, May 2004, p. 1903-1908, Vol. 42, No. 5
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.5.1903-1908.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Rapid Screening Method for Detection of Bacteria in Platelet Concentrates

Hemosystem, 13006 Marseille, France

Received 13 November 2003/ Returned for modification 3 January 2004/ Accepted 11 February 2004

Public awareness has long focused on the risks of the transmission of viral agents through blood product transfusion. This risk, however, pales in comparison to the less publicized danger associated with the transfusion of blood products contaminated with bacteria, in particular, platelet concentrates. Up to 1,000 cases of clinical sepsis after the transfusion of platelet concentrates are reported annually in the United States. The condition is characterized by acute reaction symptoms and the rapid onset of septicemia and carries a 20 to 40% mortality rate. The urgent need for a method for the routine screening of platelet concentrates to improve patient safety has long been recognized. We describe the development of a rapid and highly sensitive method for screening for bacteria in platelet concentrates for transfusion. No culture period is required; and the entire procedure, from the time of sampling to the time that the final result is obtained, takes less than 90 min. The method involves three basic stages: the selective removal of platelets by filtration following activation with a monoclonal antibody, DNA-specific fluorescent labeling of bacteria, and concentration of the bacteria on a membrane surface for enumeration by solid-phase cytometry. The method offers a universal means of detection of live, nondividing, or dead gram-negative and gram-positive bacteria in complex cellular blood products. The sensitivity is higher than those of the culture-based methods available at present, with a detection limit of 10 to 10² CFU/ml, depending upon the bacterial strain.

This article has been cited by other articles:

• Ribault, S., Faucon, A., Grave, L., Nannini, P., Faure, I. B. (2005). Detection of Bacteria in Red Blood Cell Concentrates by the Scansystem Method. J. Clin. Microbiol. 43: 2251-2255 [Abstract] [Full Text]