Determination of an inoculum effect with various cephalosporins among clinical isolates of methicillin-susceptible Staphylococcus aureus.

Abstract:

:Using 98 clinical methicillin-susceptible Staphylococcus aureus isolates of known beta-lactamase (Bla) type, we found a pronounced inoculum effect for cephalexin (mostly Bla type A and C strains), a mild inoculum effect for cephalothin (especially types B and C), and no inoculum effects for ceftriaxone and cefuroxime. Ceftobiprole showed the lowest MICs at a high inoculum but with a slight increase for Bla-positive versus Bla-negative strains. Since a potential therapeutic effect associated with a cephalosporin inoculum effect has been described, further studies are warranted.

authors

Nannini EC,Stryjewski ME,Singh KV,Rude TH,Corey GR,Fowler VG Jr,Murray BE

doi

10.1128/AAC.01325-09

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

2206-8

issue

5

eissn

0066-4804

issn

1098-6596

pii

AAC.01325-09

journal_volume

54

pub_type

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