Cardiobacterium valvarum
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Cardiobacterium valvarum is a newly described HACEK organism causing endocarditis.
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When compared morphologically, the two Cardiobacterium species are indistinguishable in culture, Gram stain, and growth characteristics. Isolates of C. valvarum show optimal growth by day 3 under standard 5% CO2 incubation conditions on 5% sheep blood but scant growth on chocolate agar. Colonies are non-hemolytic to weakly a-hemolytic on sheep blood agar. 16S PCR can be used to distinguish the Cardiobacterium species.
Clinical Microbiology Newsletter (CMN) Vol. 37, No. 16, August 15, 2015, www.cmnewsletter.com