An enterococcus (E. faecium) was isolated from a urine specimen (100,000 cfu/mL). Treatment of the patient with ampicillin and gentamicin failed. The most clinically appropriate action is

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Consider vancomycin as an alternative drug

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Do no further clinical workup

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Suggest to the laboratory that low colony counts may reflect infection

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Determine if fluorescent microscopy is available for the diagnosis of actinomycosis

An enterococcus (E. faecium) was isolated from a urine specimen (100,000 cfu/mL). Treatment of the patient with ampicillin and gentamicin failed. The most clinically appropriate action is

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