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Journal Article

Vancomycin or vancomycin plus netilmicin for methicillin- and gentamicin-resistant Staphylococcus aureus aortic valve experimental endocarditis.

G Perdikaris, H Giamarellou, A Pefanis, I Donta, P Karayiannakos
G Perdikaris
1st Department of Propedeutic Medicine, Athens University School of Medicine, Laiko General Hospital, Greece.
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H Giamarellou
1st Department of Propedeutic Medicine, Athens University School of Medicine, Laiko General Hospital, Greece.
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A Pefanis
1st Department of Propedeutic Medicine, Athens University School of Medicine, Laiko General Hospital, Greece.
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I Donta
1st Department of Propedeutic Medicine, Athens University School of Medicine, Laiko General Hospital, Greece.
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P Karayiannakos
1st Department of Propedeutic Medicine, Athens University School of Medicine, Laiko General Hospital, Greece.
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DOI: 10.1128/AAC.39.10.2289
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ABSTRACT

Using a rabbit model of aortic valve endocarditis, we studied the efficacy of vancomycin alone or in combination with netilmicin and/or rifampin against a methicillin- and gentamicin-resistant strain of Staphylococcus aureus (MGRSA). Antibiotics were given for 6 to 12 days, as follows: vancomycin (15 mg/kg of body weight every 12 h [BID] intravenously), vancomycin plus netilmicin (2.5 mg/kg BID intramuscularly), vancomycin plus rifampin (10 mg/kg BID intramuscularly), and vancomycin plus netilmicin plus rifampin at the same routes, dosages, and schedules mentioned above. Netilmicin was given to two additional groups at a higher dosage (6 mg/kg every 24 h intramuscularly) alone or in combination with vancomycin (15 mg/kg BID intravenously) for 12 days. All regimens resulted in undetectable bacterial counts in a significant proportion of vegetations (except netilmicin alone) or reduced the bacterial counts in the vegetations compared with the counts in the untreated controls (P<0.01 to P<0.001). No resistance to rifampin or netilmicin developed during therapy. It is concluded that in the treatment of experimental aortic valve endocarditis caused by MGRSA (i) vancomycin as monotherapy is as efficacious as the triple combination, (ii) the addition of netilmicin (once daily or BID) to vancomycin does not improve the efficacy of the latter antibiotic, even in the presence of rifampin, and (iii) a 12-day course in more effective than a 6-day one, but not at a statistically significant level.

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Vancomycin or vancomycin plus netilmicin for methicillin- and gentamicin-resistant Staphylococcus aureus aortic valve experimental endocarditis.
G Perdikaris, H Giamarellou, A Pefanis, I Donta, P Karayiannakos
Antimicrobial Agents and Chemotherapy Oct 1995, 39 (10) 2289-2294; DOI: 10.1128/AAC.39.10.2289

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Vancomycin or vancomycin plus netilmicin for methicillin- and gentamicin-resistant Staphylococcus aureus aortic valve experimental endocarditis.
G Perdikaris, H Giamarellou, A Pefanis, I Donta, P Karayiannakos
Antimicrobial Agents and Chemotherapy Oct 1995, 39 (10) 2289-2294; DOI: 10.1128/AAC.39.10.2289
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