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  • Title: In-vitro evaluation of cefpodoxime.
    Author: Valentini S, Coratza G, Rossolini GM, Massidda O, Satta G.
    Journal: J Antimicrob Chemother; 1994 Mar; 33(3):495-508. PubMed ID: 8040114.
    Abstract:
    In-vitro antimicrobial activity of cefpodoxime was evaluated against several microbial species by both conventional tests and additional parameters which take into consideration some of the conditions likely to be encountered in infected tissues. MICs for 414 recent clinical isolates, including staphylococci, streptococci, Haemophilus influenzae, Moraxella catarrhalis, several Enterobacteriaceae, Aeromonas hydrophila and Campylobacter jejuni were determined. MIC values overall were similar to those observed for strains from other geographical areas. Inhibition of growth by cefpodoxime was virtually unaffected by the inoculum size, even using bacterial populations as large as 10(9) cfu of Staphylococcus aureus, Streptococcus pyogenes, Streptococcus pneumoniae, H. influenzae, beta-lactamase-negative M. catarrhalis, Escherichia coli, Klebsiella pneumoniae and Proteus mirabilis. Growth in the presence of human serum as the only source of nutrients did not significantly affect the inhibition exerted by cefpodoxime, even against large bacterial populations of S. aureus, S. pneumoniae, E. coli, and K. pneumoniae. For K. pneumoniae, E. coli, P. mirabilis and beta-lactamase-negative M. catarrhalis it was also found that sub-MIC concentrations of cefpodoxime were still able to inhibit the majority of cells in microbial populations as large as 10(9) cfu. Evaluation of bactericidal activity demonstrated that cefpodoxime concentrations comparable to those achievable in plasma or in the respiratory tract were able to kill rapidly large bacterial populations of S. pneumoniae and S. pyogenes. The bactericidal activity was apparently lower against M. catarrhalis, H. influenzae, S. aureus, E. coli, and K. pneumoniae.
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