OBJECTIVES: We examined the molecular basis of the emergence of mupirocin resistance in a methicillin-resistant Staphylococcus aureus (MRSA) strain colonizing a nursing home resident undergoing mupirocin prophylaxis. PATIENT AND METHODS: A persistent carrier of mupirocin-susceptible MRSA participated in a trial of mupirocin for nasal decolonization among nursing home residents. During prophylaxis a high-level mupirocin-resistant MRSA emerged in the nasal isolates from this patient. S. aureus and coagulase-negative staphylococci were isolated prior to, during and after 14 days of mupirocin treatment. The staphylococcal isolates and their plasmids were examined by molecular genetic methods. RESULTS: All mupirocin-susceptible and -resistant MRSA isolates possessed the same genotype. The patient was also colonized by a single mupirocin-resistant Staphylococcus epidermidis strain. The mupirocin-resistant MRSA and S. epidermidis strains harboured identical plasmids that carried the mupA determinant and genes for conjugative DNA transfer in staphylococci. These plasmids could be transferred in vitro from both clinical isolates to S. aureus RN2677. CONCLUSIONS: The MRSA strain contained a conjugative plasmid expressing mupA that was identical with that found in the S. epidermidis strain which colonized the patient. These findings suggest that transfer of mupA from S. epidermidis to MRSA probably occurred during mupirocin prophylaxis.
OBJECTIVES: We examined the molecular basis of the emergence of mupirocin resistance in a methicillin-resistant Staphylococcus aureus (MRSA) strain colonizing a nursing home resident undergoing mupirocin prophylaxis. PATIENT AND METHODS: A persistent carrier of mupirocin-susceptible MRSA participated in a trial of mupirocin for nasal decolonization among nursing home residents. During prophylaxis a high-level mupirocin-resistant MRSA emerged in the nasal isolates from this patient. S. aureus and coagulase-negative staphylococci were isolated prior to, during and after 14 days of mupirocin treatment. The staphylococcal isolates and their plasmids were examined by molecular genetic methods. RESULTS: All mupirocin-susceptible and -resistant MRSA isolates possessed the same genotype. The patient was also colonized by a single mupirocin-resistant Staphylococcus epidermidis strain. The mupirocin-resistant MRSA and S. epidermidis strains harboured identical plasmids that carried the mupA determinant and genes for conjugative DNA transfer in staphylococci. These plasmids could be transferred in vitro from both clinical isolates to S. aureus RN2677. CONCLUSIONS: The MRSA strain contained a conjugative plasmid expressing mupA that was identical with that found in the S. epidermidis strain which colonized the patient. These findings suggest that transfer of mupA from S. epidermidis to MRSA probably occurred during mupirocin prophylaxis.
Authors: D A Janssen; L T Zarins; D R Schaberg; S F Bradley; M S Terpenning; C A Kauffman Journal: Antimicrob Agents Chemother Date: 1993-09 Impact factor: 5.191
Authors: C A Kauffman; M S Terpenning; X He; L T Zarins; M A Ramsey; K A Jorgensen; W S Sottile; S F Bradley Journal: Am J Med Date: 1993-04 Impact factor: 4.965
Authors: S F Bradley; M S Terpenning; M A Ramsey; L T Zarins; K A Jorgensen; W S Sottile; D R Schaberg; C A Kauffman Journal: Ann Intern Med Date: 1991-09-15 Impact factor: 25.391
Authors: Lona Mody; Carol A Kauffman; Shelly A McNeil; Andrzej T Galecki; Suzanne F Bradley Journal: Clin Infect Dis Date: 2003-11-06 Impact factor: 9.079
Authors: Jyoti Madhusoodanan; Keun Seok Seo; Brian Remortel; Joo Youn Park; Sun Young Hwang; Lawrence K Fox; Yong Ho Park; Claudia F Deobald; Dan Wang; Song Liu; Sean C Daugherty; Ann Lindley Gill; Gregory A Bohach; Steven R Gill Journal: J Bacteriol Date: 2011-02-11 Impact factor: 3.490