Streptococcus mutans endocarditis was initially diagnosed as enterococcal endocarditis. The organisms were indistinguishable by testing in two commonly used diagnostic media, Enterococcosel and S faecalis broths.
Of 97 additional S viridans cultures isolated, 10% produced false-positive reactions in Enterococcosel broth and 1% in S faecalis broth. The identification of an "enterococcus" that is sensitive to lincomycin by the use of these media should be confirmed by growth in 6.5% sodium chloride broth and on eosin methylene blue agar.
(JAMA 230:1289-1290, 1974)
Neefe LI, Chretien JH, Delaha EC, Garagusi VF. Streptococcus mutans EndocarditisConfusion With Enterococcal Endocarditis by Routine Laboratory Testing. JAMA. 1974;230(9):1298–1299. doi:10.1001/jama.1974.03240090038023
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