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Blood culture results. (A) Growth of colonies of Abiotrophia defectiva in the blood agar. (B) Gram stain reveals Gram-positive pleomorphic coccobacilli, arranged in chains (original magnification, 1,000X). (C) Antimicrobial susceptibility testing demonstrated susceptibility to vancomycin, imipenem, and meropenem, but was resistant to penicillin and levofloxacin.
