Evidence for a purifying selection acting on the β-lactamase locus in epidemic clones of methicillin-resistant Staphylococcus aureus

Catarina Milheiriço, Ana Portelinha, Ludwig Krippahl, Hermı́nia de Lencastre, Duarte C. Oliveira

BMC Microbiology · 2011 · 31 citations · 55 references

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