Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0348321 (Haemophilus)
 15,372 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Clarithromycin and its 14-hydroxy metabolite (A-62671), were tested against 20 strains of Haemophilus influenzae. Minimum inhibitory and bactericidal concentrations of the two compounds alone and in combination were determined in a microbroth system which allowed continuous turbidimetric measurement for the construction of growth curves. MICs of clarithromycin were 2-8 and 1-4 mg/l for A-62671 for the majority of strains. MBCs were identical to or one dilution higher than the respective MICs. Combinations of the two compounds were inhibitory or bactericidal at concentrations that were lower than the MICs or MBCs. On the basis of fractional inhibitory (FIC) or fractional bactericidal (FBC) concentration indices, the interactions between clarithromycin and its metabolite were defined as additive.
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PMID:In-vitro activity of clarithromycin combined with its 14-hydroxy metabolite A-62671 against Haemophilus influenzae. 182 97

We determined the effect of the combination of rifampin and fleroxacin against Enterobacteriaceae and streptococcal species. None of the 65 isolates tested by checkerboard assay demonstrated synergy, 12% of isolates showed an additive effect; 86.7% were indifferent, and only 1 isolate showed antagonism. The mean FIC was 1.2. When using 2 and 8 micrograms/ml of rifampin, fleroxacin MICs of 285 isolates of Enterobacteriaceae, Pseudomonas aeruginosa, Haemophilus influenzae, staphylococci, streptococci, Bacteroides, and Clostridium were not increased, but synergy was not demonstrated. Time-kill studies against Escherichia coli, P. aeruginosa, Enterobacter cloacae, Staphylococcus aureus, and Enterococcus faecalis failed to show increased killing when the two agents were present at one-half the MBC. The fleroxacin-rifampin interaction is one of indifference but provides coverage for species not adequately inhibited by fleroxacin.
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PMID:Fleroxacin combined with rifampin. 190 34

OBJECTIVE: To determine the combined in-vitro effects of azithromycin plus the fluoroquinolone ofloxacin or lomefloxacin against gram-positive and gram-negative bacteria. METHODS: Fractional inhibitory (FIC) and fractional bactericidal concentration indices of azithromycin and the fluoroquinolone were determined using a microtiter-checkerboard method. Clinical isolates of Staphylococcus aureus, Streptococcus pneumoniae, Neisseria gonorrhoeae, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Pseudomonas cepacia, Haemophilus influenzae, Xanthomonas maltophilia and Acinetobacter calcoaceticus were studied. Fourteen strains of S. aureus were also studied in time-kill curves with azithromycin (4 mg/L), lomefloxacin (6 mg/L) and the two in combination. RESULTS: No synergism or antagonism was found in inhibitory assays. However, bactericidal assays revealed antagonism with some strains of S. aureus, S. pneumoniae, X. maltophilia, A. calcoaceticus, P. aeruginosa, P. cepacia, K. pneumoniae and E. coli. Kill-curve results with 14 strains of S. aureus showed no antagonism with four strains of methicillin-resistant S. aureus (MRSA), and antagonism with one strain of MRSA and seven methicillin-susceptible S. aureus (MSSA). CONCLUSIONS: In-vitro exposure to combinations of azithromycin and a fluoroquinolone does not produce a synergistic effect. Antagonism was found in bactericidal assays against some gram-negative bacteria and MSSA; caution is therefore recommended in the use of macrolides and quinolones against these organisms.
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PMID:In-vitro interaction of azithromycin and fluoroquinolones against gram-positive and gram-negative bacteria. 1186 55