Apparent culture-negative prosthetic valve endocarditis caused by Peptostreptococcus magnus.
In two patients with prosthetic valve endocarditis due to Peptostreptococcus magnus, blood cultures in the BacT/Alert and BACTEC 9240 systems were signal negative. The capability of the BacT/Alert system to detect various Peptostreptococcus species was assessed. P. magnus and P. anaerobius could not be detected, and subcultures remained negative. The growth in conventional media of these two species and other Peptostreptococcus species was similar.
van der Vorm
E R
ER
Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands. ervandervorm@hotmail.com
Dondorp
A M
AM
van Ketel
R J
RJ
Dankert
J
J
D000328:Adult; D000368:Aged; D016470:Bacteremia / Q000382:microbiology*; D004697:Endocarditis, Bacterial / Q000382:microbiology*; D019918:Heart Valve Prosthesis Implantation / Q000009:adverse effects*; D006801:Humans; D008297:Male; D010462:Peptostreptococcus / Q000302:isolation & purification*