Journal Article

<i>Staphylococcus aureus menD</i> and <i>hemB</i> Mutants Are as Infective as the Parent Strains, but the Menadione Biosynthetic Mutant Persists within the Kidney

Donna M Bates, Christof von Eiff, Peter J McNamara, Georg Peters, Michael R Yeaman, Arnold S Bayer and Richard A Proctor

in The Journal of Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 187, issue 10, pages 1654-1661
Published in print May 2003 | ISSN: 0022-1899
Published online May 2003 | e-ISSN: 1537-6613 | DOI: https://dx.doi.org/10.1086/374642

Staphylococcus aureus menD and hemB Mutants Are as Infective as the Parent Strains, but the Menadione Biosynthetic Mutant Persists within the Kidney

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Small colony variants (SCVs) of Staphylococcus aureus were generated via mutations in menD or hemB yielding menadione and hemin auxotrophs, respectively, and studied in the rabbit endocarditis model. No differences in the 95% infectious dose occurred between strains with regard to seeding heart valves (∼106 cfu) or other target organs. No differences were observed between the response of the hemB mutant to oxacillin therapy and that of the parent strain in any target tissues, and significant reductions in bacterial densities were seen in all tissues (compared with untreated controls). In contrast, oxacillin therapy did not significantly reduce bacterial densities of the menD mutant in either kidney or spleen and significantly reduced densities within vegetations. These data show that SCVs are able to colonize multiple tissues in vivo and that the menD mutation provides the organism with a survival advantage during antimicrobial therapy, compared with its parent strain, in selected target tissues

Journal Article.  4286 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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