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Antimicrobial Agents and Chemotherapy, July 1999, p. 1754-1755, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Lysostaphin Treatment of Experimental Aortic Valve Endocarditis Caused by a Staphylococcus aureus Isolate with Reduced Susceptibility to Vancomycin

Roberto L. Patron,1 Michael W. Climo,1,2,* Beth P. Goldstein,3 and Gordon L. Archer1,4

Department of Internal Medicine1 and Microbiology/Immunology,4 Medical College of Virginia Campus of Virginia Commonwealth University, and Hunter Holmes McGuire Veterans Affairs Medical Center,2 Richmond, Virginia, and AMBI, Inc., Purchase, New York3

Received 4 December 1998/Returned for modification 4 February 1999/Accepted 6 April 1999

The rabbit model of endocarditis was used to test the effectiveness of vancomycin and two different lysostaphin dosing regimens for the treatment of infections caused by a Staphylococcus aureus strain with reduced susceptibility to vancomycin (glycopeptide-intermediate susceptible S. aureus [GISA]). Vancomycin was ineffective, with no evidence of sterilization of aortic valve vegetations. However, rates of sterilization of aortic valve vegetations were significantly better for animals treated with either a single dose of lysostaphin (43%) or lysostaphin given twice daily for 3 days (83%) than for animals treated with vancomycin. Rabbits given a single dose of lysostaphin followed by a 3-day drug-free period had mean reductions in aortic valve vegetation bacterial counts of 7.27 and 6.63 log10 CFU/g compared with those for untreated control rabbits and the vancomycin-treated group, respectively. We conclude that lysostaphin is an effective alternative for the treatment of experimental aortic valve endocarditis caused by a clinical VISA strain.


* Corresponding author. Mailing address: McGuire Veterans Affairs Medical Center, 1201 Broad Rock Blvd., Section 111-C, Richmond, VA 23249. Phone: (804) 675-5018. Fax: (804) 675-5437. E-mail: Climo.Michael{at}Richmond.va.gov or MWCLIMO{at}aol.com.


Antimicrobial Agents and Chemotherapy, July 1999, p. 1754-1755, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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