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Endocarditis Due to Streptococcus mitis With High-Level Resistance to Penicillin and Ceftriaxone
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To the Editor: Antimicrobial resistance is an increasing problem in the treatment of infections due to Streptococcus pneumoniae.1 Such resistance has also recently been reported in the United States among the viridans group of streptococci, especially Streptococcus mitis.2 We report a case of subacute bacterial endocarditis in a child, resulting from an infection caused by S mitis that was fully resistant to penicillin and ceftriaxone.
Report of a Case
A 22-month-old black male with a known history of a perimembranous ventricular septal defect was admitted to our hospital with a 10-day history of fever and irritability. The patient had otherwise been healthy. Both blood cultures drawn on admission grew S mitis. The sensitivity analyses showed a minimal inhibitory concentration (MIC) to penicillin of 4 µg/mL, an MIC to ceftriaxone of 4 µg/mL, and an MIC to vancomycin of 0.5 µg/mL or less. Transthoracic echocardiography revealed a large vegetation on the tricuspid . . . [Full Text of this Article]
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