Abstract:
:Two hundred clinical isolates of Haemophilus influenzae were tested for tolerance (MBC/MIC greater than or equal to 32) to ampicillin and cefotaxime by broth dilution tests. Of 200 strains, 9 were tolerant to ampicillin, and 10 were tolerant to cefotaxime. Tolerant organisms were identified in both systemic and nonsystemic infections and among different biotypes and serotypes of H. influenzae. These tolerant isolates were compared with nontolerant isolates by broth dilution and killing curves with log-phase and stationary-phase inocula. Both tolerant and nontolerant bacteria in log phase were killed more rapidly by antibiotics than bacteria in stationary-phase growth. When tested against 11 different beta-lactams, several patterns of tolerance were observed. Six of the ten strains were tolerant to aztreonam, four were tolerant to cefuroxime, three were tolerant to cefamandole, and two were tolerant to cefoxitin. Strain H130 was tolerant to all beta-lactam antibiotics studied. None of the 10 tolerant H. influenzae isolates were tolerant to chloramphenicol, rifampin, tobramycin, ciprofloxacin, enoxacin, and trimethoprim-sulfamethoxazole. Although the clinical significance of tolerance is not determined, this study suggests that the bactericidal activity (MBC) of beta-lactam antibiotics against H. influenzae should be determined in cases of severe infections in which clinical response is slow or unsatisfactory.
journal_name
Antimicrob Agents Chemotherjournal_title
Antimicrobial agents and chemotherapyauthors
Bergeron MG,Lavoie GYdoi
10.1128/aac.28.2.320subject
Has Abstractpub_date
1985-08-01 00:00:00pages
320-5issue
2eissn
0066-4804issn
1098-6596journal_volume
28pub_type
杂志文章abstract::The post-β-lactamase-inhibitor effect (PBLIE) of tazobactam combined with ceftolozane was evaluated by time-kill assays on two clinical Escherichia coli strains producing CTX-M-15 with or without TEM-1. The organisms were exposed (2 h) to 4 μg/ml/4 μg/ml of ceftolozane-tazobactam (4× MIC), 4 μg/ml of ceftolozane, and ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.02398-13
更新日期:2014-01-01 00:00:00
abstract::aac(6')-Ib-cr is a plasmid-mediated quinolone resistance gene embedded within a gene cassette, most often within an integron. It confers resistance to quinolones and aminoglycosides. We investigated the role of a 101-bp fragment frequently present upstream of the aac(6')-Ib-cr gene cassette and found that it contribut...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.02704-16
更新日期:2017-04-24 00:00:00
abstract::A total of 191 soil samples from Hangzhou, China, were submitted to detect non-wild-type (non-WT) Aspergillus fumigatus and its associated mechanisms. There were 2 (4.7%), 13 (12.4%), and 31 (23.1%) isolates identified as non-WT in 2014, 2016, and 2018, respectively. The resistant mutations of TR34/L98H, TR46/Y121F/T2...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.00904-20
更新日期:2020-09-21 00:00:00
abstract::The density of the biofilm layer produced on a plastic surface by 23 clinical isolates and 1 reference strain of slime-positive, coagulase-negative staphylococci was measured following growth in subinhibitory concentrations (sub-MICs) of cefamandole or vancomycin ranging from 2 to 0.008 micrograms/ml. All strains were...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.34.3.390
更新日期:1990-03-01 00:00:00
abstract::Clostridium difficile causes antibiotic-associated diarrhea and is a major public health concern. Current therapies disrupt the protective intestinal flora, do not reliably prevent recurrent infections, and will be decreasingly effective should less susceptible strains emerge. CRS3123 is an oral agent that inhibits ba...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.02760-16
更新日期:2017-07-25 00:00:00
abstract::Tobramycin-resistant burn wound isolates of Klebsiella pneumoniae and Enterobacter cloacae, together with Escherichia coli K-12 transconjugants from these two strains, were examined for plasmid deoxyribonucleic acid (DNA). All the resistant strains contained a common, high-molecular-weight, covalently closed circular ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.13.2.312
更新日期:1978-02-01 00:00:00
abstract::The aim of this analysis was to identify therapeutic micafungin regimens for children that produce the same micafungin exposures known to be effective for the prevention and treatment of Candida infections in adults. Pediatric pharmacokinetic data from 229 patients between the ages of 4 months and <17 years were obtai...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章,随机对照试验
doi:10.1128/AAC.03736-14
更新日期:2015-02-01 00:00:00
abstract::A basic, random copolymer of l-ornithine and l-leucine (OL; molar ratios 1:1) was bactericidal to a sensitive (S) strain of Staphylococcus aureus at low concentration. Resistant cells (R) were selected from the culture medium and, after serial transfers to solutions containing increasing amounts of the polymer, grew w...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.5.2.179
更新日期:1974-02-01 00:00:00
abstract::ACH-702, a novel isothiazoloquinolone (ITQ), was assessed for antibacterial activity against a panel of Gram-positive and Gram-negative clinical isolates and found to possess broad-spectrum activity, especially against antibiotic-resistant Gram-positive strains, including methicillin-resistant Staphylococcus aureus (M...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.01666-10
更新日期:2011-06-01 00:00:00
abstract::In this study, susceptibilities were determined for AZD0914, a spiropyrimidinetrione DNA gyrase inhibitor, azithromycin, doxycycline, and levofloxacin against Mycoplasma and Ureaplasma species. The activity of AZD0914 was comparable to that of levofloxacin and doxycycline against Mycoplasma genitalium and Mycoplasma p...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.04945-14
更新日期:2015-01-01 00:00:00
abstract::Omadacycline is an aminomethylcycline antibiotic with in vitro activity against pathogens causing community-acquired bacterial pneumonia (CABP). This study investigated the activity of omadacycline against Legionella pneumophila strains isolated between 1995 and 2014 from nosocomial or community-acquired respiratory i...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.01972-19
更新日期:2020-04-21 00:00:00
abstract::We have evaluated the susceptibility of the murine gamma herpesvirus 68 (MHV-68) to a variety of antiviral agents. The acyclic nucleoside phosphonate analogs cidofovir [(S)-1-(3-hydroxy-2-phosphonylmethoxypropyl) cytosine], (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)adenine (HPMPA), and adefovir [9-(2-phosphonylmethox...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.42.1.170
更新日期:1998-01-01 00:00:00
abstract::Thirteen derivatives of the Streptococcus pneumoniae TIGR4 strain in which putative drug efflux pumps were genetically inactivated were constructed and characterized. The results indicate that two linked genes encoding the ABC-type transporters SP2073 and SP2075 function together to confer intrinsic resistance to a se...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.49.11.4781-4783.2005
更新日期:2005-11-01 00:00:00
abstract::Bloodstream infection (BSI) due to multidrug-resistant Klebsiella is associated with high rates of morbidity and mortality. The aim of this study was to identify predictors of in-hospital mortality among patients with BSI due to ceftazidime-resistant (CAZ-R) Klebsiella pneumoniae at a tertiary care medical center. Pat...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.50.5.1715-1720.2006
更新日期:2006-05-01 00:00:00
abstract::Berberine sulfate is an alkaloid extracted from the roots and bark of various plants and possesses antibacterial, antifungal, and antiprotozoal activities. Most studies have focused on the bacteriostatic or bactericidal activities of this compound. In this study, we report that berberine sulfate is bacteriostatic for ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.32.9.1370
更新日期:1988-09-01 00:00:00
abstract::In both primary rabbit kidney cells and human skin fibroblasts, 5-propyl-2'-deoxyuridine proved inhibitory to herpes simplex virus at a concentration as low as 1 micrograms/ml, whereas concentrations higher than 200 micrograms/ml were required to inhibit vaccinia virus replication or normal cell metabolism. ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.13.3.545
更新日期:1978-03-01 00:00:00
abstract::For treatment of mild to moderate Clostridium difficile-associated disease (CDAD), oral metronidazole has been recommended as the preferred agent, in part due to concern that vancomycin may be more likely to promote colonization by vancomycin-resistant enterococci (VRE). We performed a prospective observational study ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.00090-08
更新日期:2008-07-01 00:00:00
abstract::Bacteriophage therapy is a promising alternative treatment to antibiotics, as it has been documented to be efficacious against multidrug-resistant bacteria with minimal side effects. Several groups have demonstrated the efficacy of phage suspension in vivo to treat lung infections using intranasal delivery; however, p...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.01714-17
更新日期:2018-01-25 00:00:00
abstract::Viridans group streptococci (VGS) are part of the normal flora that may cause bacteremia, often leading to endocarditis. We evaluated daptomycin against four clinical strains of VGS (MICs = 1 or 2 μg/ml) using an in vitro-simulated endocardial vegetation model, a simulated bacteremia model, and kill curves. Daptomycin...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.04219-14
更新日期:2015-04-01 00:00:00
abstract::After vaginal insertion of a 300-mg ovule of tioconazole in 10 patients with vaginal candidiasis, the mean concentration in plasma was 21.2 ng/ml (range, 10.6 to 35.8 ng/ml) at 8 h and was not measurable at 24 h in 9 of 10 patients. The mean vaginal concentration at 24 h was 21.4 mg/liter (range, 2.4 to 50 mg/liter) a...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.27.6.964
更新日期:1985-06-01 00:00:00
abstract::Lactation studies are necessary evaluations of medications for reproductive-age women. We evaluated pharmacokinetics (PK), pharmacodynamics, safety, and adherence profiles associated with 7 days of 1% tenofovir (TFV) vaginal gel use during lactation. Tenofovir levels (maternal/infant serum, milk) and anti-HIV activity...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.00645-16
更新日期:2016-08-22 00:00:00
abstract::Twenty-four Staphylococcus species and their subspecies were examined for their susceptibilities to teicoplanin by disk diffusion (30-micrograms disk) and agar dilution for the determination of MICs. Moderately susceptible and resistant clinical strains were further tested for their susceptibilities to oxacillin and v...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.35.9.1919
更新日期:1991-09-01 00:00:00
abstract::In an effort to discover novel, noncarbohydrate inhibitors of influenza virus neuraminidase we hypothesized that compounds which contain positively charged amino groups in an appropriate position to interact with the Asp 152 or Tyr 406 side chains might be bound tightly by the enzyme. Testing of 300 alpha- and beta-am...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.45.9.2563-2570.2001
更新日期:2001-09-01 00:00:00
abstract::Placental drug transfer is important for achieving better pharmacotherapy in pregnant women and in fetuses. In the present study, we examined the effects of anti-hepatitis C virus (HCV) and anti-HIV drugs on organic anion transport in human placental BeWo cells. The cellular uptake of two fluorescence organic anions, ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.01634-15
更新日期:2015-12-01 00:00:00
abstract::Aminoglycoside acetyltransferase was detected in Mycobacterium kansasii and M. fortuitum but not in M. avium-M. intracellulare when they were screened by a radioassay. Aminoglycoside phosphotransferase and nucleotidyltransferase activities were absent from all three species tested. Acetyltransferases from both M. kans...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.44.1.39-42.2000
更新日期:2000-01-01 00:00:00
abstract::Piperaquine (PQ) is an important partner drug in antimalarial combination treatments, but the long half-life of PQ raises concerns about drug resistance. Our aim was to investigate the extended antimalarial effect of PQ in a study of drug efficacy, reinoculation outcomes, and parasite viability after the administratio...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.00056-09
更新日期:2009-07-01 00:00:00
abstract::Chloramphenicol acetyltransferases specified by fi(-) (F fertility-noninhibiting) R factors were compared with those specified by the fi(+) R factors R1, 222, and R6-S. Three classes of enzyme were distinguished: class I was determined by group N fi(-) R factors and was indistinguishable from the enzyme determined by ...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/aac.3.1.99
更新日期:1973-01-01 00:00:00
abstract::Two bla(OXA-48)-like-positive isolates (Klebsiella pneumoniae and Enterobacter cloacae) were recovered in Argentina in 2008 as part of a large-scale survey focused on multidrug resistance in Enterobacteriaceae. In both cases, sequencing identified β-lactamase OXA-163, differing from OXA-48 by a single amino substituti...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.00022-11
更新日期:2011-06-01 00:00:00
abstract::The design of novel integrase (IN) inhibitors has been aided by recent crystal structures revealing the binding mode of these compounds with a full-length prototype foamy virus (PFV) IN and synthetic viral DNA ends. Earlier docking studies relied on incomplete structures and did not include the contribution of the vir...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.05292-11
更新日期:2012-01-01 00:00:00
abstract::We previously reported the isolation of a laboratory-derived Staphylococcus aureus mutant, 523k, that has constitutive low-level resistance to vancomycin (MIC = 5 micrograms/ml) and teicoplanin (MIC = 5 micrograms/ml) and elaborates a ca. 39-kDa cytoplasmic protein that was not detected in the parent strain 523 (MIC =...
journal_title:Antimicrobial agents and chemotherapy
pub_type: 杂志文章
doi:10.1128/AAC.40.1.166
更新日期:1996-01-01 00:00:00