Frequency of reduced vancomycin susceptibility and heterogeneous subpopulation in persistent or recurrent methicillin-resistant Staphylococcus aureus bacteremia.

Khosrovaneh, Amir; Riederer, Kathleen; Saeed, Sajjad; Tabriz, M Shamse; Shah, Amar R; Hanna, Michel M; Sharma, Mamta; Johnson, Leonard B et al. · Clin Infect Dis · 2004

case_series · Level IV

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Abstract

Vancomycin susceptibility was checked in isolates from initial and final blood samples obtained from 22 patients with persistent or recurrent methicillin-resistant Staphylococcus aureus bacteremia. The minimum inhibitory concentration of vancomycin was determined using Etest and found to have increased in 2 pairs of isolates, and results of screening in 4 mu g vancomycin and a modified population analysis profile suggested heteroresistance in 3 isolates (13.6%). Heteroresistance is not a common cause of persistent or recurrent bacteremia.

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