Topic
Penicillin
About: Penicillin is a research topic. Over the lifetime, 17916 publications have been published within this topic receiving 368480 citations. The topic is also known as: penicillin antibiotic & PCN.
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TL;DR: It is concluded that a two-dose, single-day regimen of orally administered norfloxacin is effective therapy for uncomplicated urethritis caused by penicillin-resistant strains of N. gonorrhoeae.
Abstract: Norfloxacin, an orally administered quinoline carboxylic acid that is structurally related to nalidixic acid, has been shown to be highly active in vitro against penicillinase-producing Neisseria gonorrhoeae. Ninety-two men with culture-proved gonococcal urethritis, 46 per cent with penicillinase-producing N. gonorrhoeae, and 27 per cent with non-penicillinase-producing N. gonorrhoeae that was resistant to penicillin were given either 1200 mg of norfloxacin divided into two equal oral doses four hours apart (59 patients) or 2 g of spectinomycin intramuscularly (33 patients). All patients in both treatment groups were cured. No adverse reactions were reported in either group. We conclude that a two-dose, single-day regimen of orally administered norfloxacin is effective therapy for uncomplicated urethritis caused by penicillin-resistant strains of N. gonorrhoeae.
77 citations
TL;DR: It was observed that certain doses of penicillin so administered to mice, cats, dogs and monkeys gave rise to convulsive manifestations and the effect of the drug when administered intracisternally, intraventricularly and locally to the cerebral cortex either by application to the subdural space or by intracortical injection.
Abstract: Reports on intrathecal administration of penicillin in treating infections of the central nervous system are becoming numerous. Recently intraventricular injection of penicillin has been employed when meningitis did not respond to parenteral or intrathecal modes of administration. 1 The direct application of penicillin to wounds of the cerebral cortex in the treatment of injury to the head has also been suggested. 2 Our interest in the effect of penicillin on the central nervous system was aroused by observing convulsive seizures following intraventricular injection of the drug in a case of ventriculitis. 3 Experiments were then planned to investigate the effect of the drug when administered intracisternally, intraventricularly and locally to the cerebral cortex either by application to the subdural space or by intracortical injection. Such experiments were performed, and it was observed that certain doses of penicillin so administered to mice, cats, dogs and monkeys gave rise to convulsive manifestations.
77 citations
TL;DR: Follow-up studies of large numbers of patients taking prophylactic penicillin have found no increase in the incidence of endocarditis,10 and few cases of peniillin-resistant bacteria in the gingival flora.
Abstract: OPTIMAL management of patients with rheumatic heart disease or a previous bout of acute rheumatic fever includes the administration of prophylactic antibiotics to prevent pharyngeal infection with Group A streptococci.1 , 2 Several studies have shown that oral penicillin prophylaxis is associated with a high prevalence of penicillin-resistant bacteria in the gingival flora.3 4 5 6 7 8 9 An original concern was that continuous low-dose prophylaxis would result in a high incidence of endocarditis due to resistant organisms that would be difficult to cure. Follow-up studies of large numbers of patients taking prophylactic penicillin have found no increase in the incidence of endocarditis,10 and few cases of . . .
77 citations
TL;DR: Co-carriage of OXA-1, a penicillinase with weak affinity for inhibitors, is a major correlate of resistance to piperacillin/tazobactam and co-amoxiclav in E. coli and is commonly associated with co-carriages of aac(6')-Ib-cr, which narrows aminoglycoside options.
Abstract: Background ESBL-producing Escherichia coli have expanded globally since the turn of the century and present a major public health issue. Their in vitro susceptibility to penicillin/inhibitor combinations is variable, and clinical use of these combinations against ESBL producers remains controversial. We hypothesized that this variability related to co-production of OXA-1 penicillinase. Methods During a national study we collected 293 ESBL-producing E. coli from bacteraemias, determined MICs by BSAC agar dilution, and undertook genomic sequencing with Illumina methodology. Results The collection was dominated by ST131 (n = 188 isolates, 64.2%) and blaCTX-M-15 (present in 229 isolates, 78.2%); over half the isolates (159/293, 54.3%) were ST131 with blaCTX-M-15. blaOXA-1 was found in 149 ESBL producers (50.9%) and blaTEM-1/191 in 137 (46.8%). Irrespective of whether all isolates were considered, or ST131 alone, there were strong associations (P < 0.001) between co-carriage of blaOXA-1 and reduced susceptibility to penicillin/inhibitor combinations, whereas there was no significant association with co-carriage of blaTEM-1/191. For piperacillin/tazobactam the modal MIC rose from 2 mg/L in the absence of blaOXA-1 to 8 or 16 mg/L in its presence; for co-amoxiclav the shift was smaller, from 4 or 8 to 16 mg/L, but crossed the breakpoint. blaOXA-1 was strongly associated with co-carriage also of aac(6′)-Ib-cr, which compromises amikacin and tobramycin. Conclusions Co-carriage of OXA-1, a penicillinase with weak affinity for inhibitors, is a major correlate of resistance to piperacillin/tazobactam and co-amoxiclav in E. coli and is commonly associated with co-carriage of aac(6′)-Ib-cr, which narrows aminoglycoside options.
77 citations
Journal Article•
TL;DR: The data suggest that cytokines produced by Th2 cells play an important role in all beta-L-induced ADR, even when late clinical manifestations occur and an IgE-mediated mechanism is apparently indemonstrable.
Abstract: A positive lymphocyte transformation test to β-lactams (β-L) was found in 12 of 29 subjects with adverse drug reaction (ADR) to β-L, irrespective of either the type of clinical manifestation or the presence of specific serum IgE. Short-term T cell lines specific for penicillin G, amoxicillin, and ampicillin could be generated only from subjects with ADR (eight with positive and one with negative lymphocyte transformation test), while streptokinase and Dermatophagoides pteronyssinus group 1 (Der p 1)-specific T cells were obtained from all these subjects, from 7 atopic Der p-sensitive donors without history of ADR and 17 healthy nonatopic donors. Streptokinase-specific T cells from all subjects showed intracellular expression of IFN-γ with poor or no IL-4, whereas Der p 1-specific T cells exhibited IFN-γ but low or no IL-4 expression in nonatopics, and remarkable IL-4 expression in atopic donors. By contrast, all penicillin G-, ampicillin-, and amoxicillin-specific short-term T cell lines showed high intracellular expression of IL-4, IL-5, and IL-13, but poor or no expression of IFN-γ, thus exhibiting a clear-cut Th2 profile. Accordingly, most penicillin G-specific T cell clones derived from two subjects with ADR released high concentrations of IL-4 alone or IL-4 and IFN-γ. These data suggest that cytokines produced by Th2 cells play an important role in all β-L-induced ADR, even when late clinical manifestations occur and an IgE-mediated mechanism is apparently indemonstrable.
77 citations