Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:Q29983 (MIC)
 21,138 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In patients with pleural effusions due to malignant disease, estimations of ampicillin were made on simultaneously obtained samples of blood and pleural fluid: (1) from patients (n=11) after the administration of a single dose of 400 mg of bacampicillin, and (2) from patients undergoing treatment with 800 mg of bacampicillin twice daily (a) during the 12 hours after the first dose (n=10) and (b) during the 7 hours after the third dose (n=9). Bacampicillin gave concentrations in the pleural fluid well above the MIC of common pathogens including H. influenzae. Mean peak levels were 1.2 microgram/ml after the 400 mg dose and 3.8 microgram/ml after the first and third doses of 800 mg. The peak appeared later in the pleural fluid in comparison with serum peak levels. The elimination half life was considerably longer in the pleural fluid.
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PMID:Concentrations of ampicillin in pleural fluid and serum after single and repetitive doses of bacampicillin. 27 82

17 infants and children with pyogenic meningitis (14 Haemophilus influenzae, 2 Diplococcus pneumoniae, 1 Neisseria meningitidis) were treated with thiamphenicol, 100 mg/kg body weight/day in 4 doses i.v., as single drug. In the H. influenzae group 10 patients were cured, 4 had relapses of meningitis, 3 with documented subdural effusions. This group is compared with 14 children matched for age, initial leucocyte and CSF cell count treated with ampicillin: all of these were cured, 1 had a subdural effusion. Thiamphenicol concentrations were determined in the serum and CSF 2 h after administration. The mean serum levels were between 10-12 mcg/ml, the mean CSF levels varied from 5.4 mcg/ml at the beginning to 1-1.9 mcg/ml at the end of meningitis. The MIC of H. influenzae was 0.6-12 mcg/ml. A significant, acute, and dose related bone marrow toxicity of thiamphenicol could be documented, but was always rapidly fully reversible. We conclude that thiamphenicol cannot replace chloramphenicol in the treatment of pyogenic meningitis as single systemic antibiotic. Special indications for thiamphenicol in this disease are discussed.
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PMID:Thiamphenicol in treatment of Haemophilus influenzae meningitis. 31 71

This report deals with the results of a study that was made on the passage of fosfomycin into the CSF in 22 children with meningitis (11 parotideal meningitis and 11 meningococcal meningitis). The plasma and liquor levels of fosfomycin were determined in the acute phase of the illness and after the normalization of the CSF, with the object of studying the passage of the antibiotic through the blood-brain barrier in the presence and absence of meningeal inflammation. A greater permeability of the meninges was found to exist when they were in an inflammatory state and there seems to be a certain accumulative effect in the CSF when the fosfomycin is administered by intravenous perfusion. The concentrations that were obtained in the CSF were not high enough to justify the exclusive use of fosfomycin in the treatment of meningitis. Nevertheless, considering its wide antibacterial spectrum, its MIC against different microbial species and its lack of toxicity, we believe that fosfomycin can be of use when associated with other antibiotics in the treatment of meningitis caused by S. aureus, D. pneumoniae, H. influenzae, E. coli, P. mirabilis and S. marcescens.
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PMID:The passage of fosfomycin into the cerebrospinal fluid in children's meningitis. 83 14

Haemophilus influenzae type B, strain W-2, is highly resistant to ampicillin (MIC, 12.5 mug/ml). The ampicillin resistance of strain W-2 was transferred to an antibiotic-sensitive strain TF-2 (RifR, SmR) during mixed incubation on membrane filters at 36 C(transfeer frequency, 4.6 times 10(-5) per donor). Resistance was also transferred from the primary recipient to a secondary one (TF-3, EryR, NovR). The transfer frequency between these derivative strains was 10(-4) after incubation for 30 min. Resistance in strain W-2 remained even after growth in the presence of ethidium bromide or at an elevated temperature, although ampicillin resistance was lost from 13%-25% of transcipient cells after growth in broth. Strain W-2 and transcipients of ampicillin resistance had equivalent levels of beta-lactamase activity, while sensitive segregants and recipient strains demonstrated little or no enzyme activity. Transfer of ampicillin resistance between strains of H. influenzae is probably mediated by conjugation since transfer (1) requires cell-to-cell contact, (2) remains unchanged in the presence of DNase I, and (3) occurs in the absence of demonstrable bacteriophage.
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PMID:Transfer of ampicillin resistance between strains of Haemophilus influenzae type B. 108 Apr 95

Susceptibility to ampicillin and chloramphenicol in vitro has been determined for Haemophilus influenzae strains isolated from blood and/or cerebrospinal fluid cultures of patients admitted to two Atlanta hospitals from 1 January 1974 to 31 March 1975. Since the appearance of ampicillin-resistant strains of this organism in early 1974, chloramphenicol has been used in these hospitals as initial therapy for severe infection due to H. influenzae. Strains from five of 94 patients were resistant to ampicillin (minimum inhibitory concentration [MIC] >/= 12.5 mug/ml), but all strains were susceptible to chloramphenicol (MIC < 2 mug/ml). The first 35 strains studied, including three resistant to ampicillin, were also tested for in vitro susceptibility to trimethoprim-sulfamethoxazole; all were highly susceptible (MIC </= 0.0312 mug of trimethoprim and 0.625 mug of sulfamethoxazole per ml).
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PMID:Susceptibility of Haemophilus influenzae isolates from blood and cerebrospinal fluid to ampicillin, chloramphenicol, and trimethoprim-sulfamethoxazole. 108 98

Chloramphenicol is presently the drug of choice in the initial treatment of serious infections due to Hemophilus influenzae type b. Rapid detection of ampicillin resistance in clinical isolates would facilitate early discontinuation of chloramphenicol therapy in patients infected with ampicillin-sensitive bacteria. A total of 160 strains of H. influenzae type b were tested with a one-hour acidimetric microassay for beta-lactamase activity. All ampicillin-resistant strains rapidly hydrolysed the beta-lactam ring of penicillin. When isolates were encoded and tested without knowledge of their MICs, the 40 ampicillin-resistant strains (MIC greater than or equal to 2 mug/ml) were readily distinguished from 120 sensitive strains. Rapid beta-lactamase assay is therefore a reliable detector of ampicillin resistance in H. influenzae type b.
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PMID:Evaluation of a rapid beta-lactamase test for detecting ampicillin-resistant strains of Hemophilus influenzae type b. 108 35

We studied the effect of subinhibitory concentrations of cefuroxime on the capacity of Haemophilus influenzae to adhere to buccal epithelial cells (BEC). Two encapsulated strains (serotype b) and two nonencapsulated, nontypable strains were studied. All four strains adhered strongly to BEC, with indices (mean number of bacteria adhering to a single BEC) ranging from 19 to 48. Subinhibitory concentrations of cefuroxime (serial dilutions from MIC/2 to MIC/32) were added to cultures in tryptic soy broth and their effect on adherence was tested after 18 h incubation at 37 degrees C. Adherence was diminished by more than 50% by concentrations of cefuroxime ranging from MIC/2 to MIC/8 and varied according to the strain studied. These results show that the adherence of H. influenzae to BEC is inhibited by subinhibitory concentrations of cefuroxime.
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PMID:Inhibition of Haemophilus influenzae adherence to buccal epithelial cells by cefuroxime. 128 68

A multilaboratory study was performed to establish broth microdilution MIC quality control (QC) guidelines for 10 investigational drugs which previously demonstrated significant activity against Haemophilus influenzae. MIC QC ranges for H. influenzae ATCC 49247 with Haemophilus test medium were determined by using multiple contemporary lots of Haemophilus test medium and the National Committee for Clinical Laboratory Standards' recommended numbers of replicate tests. On the basis of these results, QC ranges (generally modal MIC +/- one log2 dilution) are proposed for cefdinir, cefepime, cefetamet, cefpirome, ceftibuten, fleroxacin, temafloxacin, clarithromycin, RP59500, and trospectomycin. The proposed QC guidelines for clarithromycin and temafloxacin were recently accepted by the National Committee for Clinical Laboratory Standards.
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PMID:MIC quality control guidelines for Haemophilus susceptibility tests using cefdinir (FK482), cefepime, cefetamet, cefpirome, ceftibuten, fleroxacin, temafloxacin, clarithromycin, RP59500, and trospectomycin. 131 Mar 29

We compared the activities of azithromycin and erythromycin against Haemophilus influenzae in a mouse model of nonparenchymatous lower respiratory tract infection. In vitro and in vivo efficacy data for both drugs were analyzed relative to their pharmacokinetics in lungs and in vivo uptake by phagocytes. Aged C57BL/6 mice (mean age, 15.1 +/- 1.9 months) were infected intratracheally with 10(8) CFU of H. influenzae serotype b. Oral drug administration was initiated 4 h after infection by various dosage regimens. In terms of bacterial killing in the lung, azithromycin was much more active than erythromycin (P less than 0.01). Its in vivo activity was also more durable after a single administration relative to the durability of three doses of erythromycin given at 6-h intervals. The MIC of azithromycin was eightfold lower than that of erythromycin, and better penetration and a longer half-life in lung tissue were achieved after a single oral administration. Phagocytes delivered increased amounts of both drugs to the infected lungs, particularly at the site of infection (bronchoalveolar airspaces), and detectable levels of azithromycin were maintained locally for long periods. The fact that the efficacy of azithromycin coincided with the arrival of large numbers of polymorphonuclear leukocytes within the airspaces suggests that active extracellular concentrations were provided by the release of azithromycin from these cells. This further supports the potential value of once-daily azithromycin regimens for the treatment of lower respiratory tract infections in humans, provided that inhibitory concentrations against common pathogens such as H. influenzae are maintained for adequate periods of time.
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PMID:Activity and local delivery of azithromycin in a mouse model of Haemophilus influenzae lung infection. 132 44

Haemophilus influenzae isolates were uniformly susceptible to enoxacin, ofloxacin, and temafloxacin. Zone diameter and MIC interpretive criteria were proposed to define susceptible populations so that mutants with diminished susceptibility might be detected when and if they appear in clinical specimens. Additional collaborative quality control studies defined MIC and zone size limits for tests with H. influenzae ATCC 49247.
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PMID:Interpretive criteria and quality control parameters for testing susceptibility of Haemophilus influenzae to enoxacin, ofloxacin, and temafloxacin. 133 87


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