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Publication Record


In vitro characterization of the anti-bacterial activity of SQ109 against Helicobacter pylori.
Makobongo MO, Einck L, Peek RM, Merrell DS
(2013) PLoS One 8: e68917
MeSH Terms: Adamantane, Amoxicillin, Antitubercular Agents, Cell Membrane, Chloramphenicol, Clarithromycin, Drug Resistance, Multiple, Bacterial, Drug Synergism, Duodenal Ulcer, Duodenitis, Ethylenediamines, Gastritis, Helicobacter Infections, Helicobacter pylori, Humans, Hydrogen-Ion Concentration, Metronidazole, Microbial Sensitivity Tests, Microscopy, Electron, Stomach Ulcer
Show Abstract · Added September 3, 2013
The most evident challenge to treatment of Helicobacter pylori, a bacterium responsible for gastritis, peptic ulcers and gastric cancer, is the increasing rate of resistance to all currently used therapeutic antibiotics. Thus, the development of novel therapies is urgently required. N-geranyl-N'-(2-adamantyl) ethane-1, 2-diamine (SQ109) is an ethylene diamine-based antitubercular drug that is currently in clinical trials for the treatment of tuberculosis (TB). Previous pharmacokinetic studies of SQ109 revealed that persistently high concentrations of SQ109 remain in the stomach 4 hours post oral administration in rats. This finding, combined with the need for new anti-Helicobacter therapies, prompted us to define the in vitro efficacy of SQ109 against H. pylori. Liquid broth micro-dilution was used for susceptibility studies to determine the antimicrobial activity of SQ109 against a total of 6 laboratory strains and 20 clinical isolates of H. pylori; the clinical isolates included a multi-drug resistant strain. All strains tested were susceptible to SQ109 with MIC and MBC ranges of 6-10 µM and 50-60 µM, respectively. SQ109 killing kinetics were concentration- and time-dependent. SQ109 killed H. pylori in 8-10 h at 140 µM (2MBCs) or 4-6 h at 200 µM (~3MBCs). Importantly, though the kinetics of killing were altered, SQ109 retained potent bactericidal activity against H. pylori at low pH. Additionally, SQ109 demonstrated robust thermal stability and was effective at killing slow growing or static bacteria. In fact, pretreatment of cultures with a bacteriostatic concentration of chloramphenicol (Cm) synergized the effects of typically bacteriostatic concentrations of SQ109 to the level of five-logs of bacterial killing. A molar-to-molar comparison of the efficacy of SQ109 as compared to metronidazole (MTZ), amoxicillin (AMX), rifampicin (RIF) and clarithromycin (CLR), revealed that SQ109 was superior to MTZ, AMX and RIF but not to CLR. Finally, the frequency of resistance to SQ109 was low and electron microscopy studies revealed that SQ109 interacted with bacterial inner membrane and cytoplasmic content(s). Collectively, our in vitro data demonstrate that SQ109 is an effective monotherapy against susceptible and multi-drug resistant strains of H. pylori and may be useful alone or in combination with other antibiotics for development as a new class of anti-Helicobacter drugs.
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2 Members
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20 MeSH Terms
Risk of recurrent Helicobacter pylori infection 1 year after initial eradication therapy in 7 Latin American communities.
Morgan DR, Torres J, Sexton R, Herrero R, Salazar-Martínez E, Greenberg ER, Bravo LE, Dominguez RL, Ferreccio C, Lazcano-Ponce EC, Meza-Montenegro MM, Peña EM, Peña R, Correa P, Martínez ME, Chey WD, Valdivieso M, Anderson GL, Goodman GE, Crowley JJ, Baker LH
(2013) JAMA 309: 578-86
MeSH Terms: 2-Pyridinylmethylsulfinylbenzimidazoles, Adult, Amoxicillin, Anti-Infective Agents, Bismuth, Breath Tests, Clarithromycin, Drug Administration Schedule, Drug Therapy, Combination, Enzyme Inhibitors, Female, Follow-Up Studies, Helicobacter Infections, Humans, Lansoprazole, Latin America, Male, Medication Adherence, Metronidazole, Middle Aged, Primary Prevention, Recurrence, Risk, Stomach Neoplasms, Young Adult
Show Abstract · Added September 3, 2013
IMPORTANCE - The long-term effectiveness of Helicobacter pylori eradication programs for preventing gastric cancer will depend on recurrence risk and individual and community factors.
OBJECTIVE - To estimate risk of H. pylori recurrence and assess factors associated with successful eradication 1 year after treatment.
DESIGN, SETTING, AND PARTICIPANTS - Cohort analysis of 1463 randomized trial participants aged 21 to 65 years from 7 Latin American communities, who were treated for H. pylori and observed between September 2009 and July 2011.
INTERVENTIONS - Randomization to 1 of 3 treatment groups: 14-day lansoprazole, amoxicillin, and clarithromycin (triple therapy); 5-day lansoprazole and amoxicillin followed by 5-day lansoprazole, clarithromycin, and metronidazole (sequential); or 5-day lansoprazole, amoxicillin, clarithromycin, and metronidazole (concomitant). Participants with a positive (13)C-urea breath test (UBT) 6 to 8 weeks posttreatment were offered voluntary re-treatment with 14-day bismuth-based quadruple therapy.
MEASUREMENTS - Recurrent infection after a negative posttreatment UBT and factors associated with successful eradication at 1-year follow-up.
RESULTS - Among participants with UBT-negative results who had a 1-year follow-up UBT (n=1091), 125 tested UBT positive, a recurrence risk of 11.5% (95% CI, 9.6%-13.5%). Recurrence was significantly associated with study site (P = .03), nonadherence to initial therapy (adjusted odds ratio [AOR], 2.94; 95% CI, 1.31-6.13; P = .01), and children in the household (AOR, 1.17; 95% CI, 1.01-1.35 per child; P = .03). Of the 281 with positive posttreatment UBT results, 138 completed re-treatment, of whom 93 tested UBT negative at 1 year. Among the 1340 who had a 1-year UBT, 80.4% (95% CI, 76.4%-83.9%), 79.8% (95% CI, 75.8%-83.5%), and 77.8% (95% CI, 73.6%-81.6%) had UBT-negative results in the triple, sequential, and concomitant groups, respectively (P = .61), with 79.3% overall effectiveness (95% CI, 77.1%-81.5%). In a single-treatment course analysis that ignored the effects of re-treatment, the percentage of UBT-negative results at 1 year was 72.4% (95% CI, 69.9%-74.8%) and was significantly associated with study site (P < .001), adherence to initial therapy (AOR, 0.26; 95% CI, 0.15-0.42; P < .001), male sex (AOR, 1.63; 95% CI, 1.25-2.13; P < .001), and age (AOR, 1.14; 95% CI, 1.02-1.27 per decade; P = .02). One-year effectiveness among all 1463 enrolled participants, considering all missing UBT results as positive, was 72.7% (95% CI, 70.3%-74.9%).
CONCLUSIONS AND RELEVANCE - One year after treatment for H. pylori infection, recurrence occurred in 11.5% of participants who had negative posttreatment UBT results. Recurrence determinants (ie, nonadherence and demographics) may be as important as specific antibiotic regimen in determining the long-term success of H. pylori eradication interventions. Study findings are relevant to the feasibility of programs for the primary prevention of gastric cancer in high-incidence regions of Latin America.
TRIAL REGISTRATION - clinicaltrials.gov Identifier: NCT01061437.
0 Communities
3 Members
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25 MeSH Terms
Fifteen-year effects of Helicobacter pylori, garlic, and vitamin treatments on gastric cancer incidence and mortality.
Ma JL, Zhang L, Brown LM, Li JY, Shen L, Pan KF, Liu WD, Hu Y, Han ZX, Crystal-Mansour S, Pee D, Blot WJ, Fraumeni JF, You WC, Gail MH
(2012) J Natl Cancer Inst 104: 488-92
MeSH Terms: Adult, Aged, Amoxicillin, Anti-Bacterial Agents, Ascorbic Acid, China, Confounding Factors (Epidemiology), Dietary Supplements, Factor Analysis, Statistical, Female, Follow-Up Studies, Garlic, Gastrointestinal Agents, Helicobacter Infections, Helicobacter pylori, Humans, Incidence, Logistic Models, Male, Middle Aged, Odds Ratio, Omeprazole, Precancerous Conditions, Proportional Hazards Models, Stomach Neoplasms, Vitamin E, Vitamins
Show Abstract · Added March 20, 2014
In the Shandong Intervention Trial, 2 weeks of antibiotic treatment for Helicobacter pylori reduced the prevalence of precancerous gastric lesions, whereas 7.3 years of oral supplementation with garlic extract and oil (garlic treatment) or vitamin C, vitamin E, and selenium (vitamin treatment) did not. Here we report 14.7-year follow-up for gastric cancer incidence and cause-specific mortality among 3365 randomly assigned subjects in this masked factorial placebo-controlled trial. Conditional logistic regression was used to estimate the odds of gastric cancer incidence, and the Cox proportional hazards model was used to estimate the relative hazard of cause-specific mortality. All statistical tests were two-sided. Gastric cancer was diagnosed in 3.0% of subjects who received H pylori treatment and in 4.6% of those who received placebo (odds ratio = 0.61, 95% confidence interval = 0.38 to 0.96, P = .032). Gastric cancer deaths occurred among 1.5% of subjects assigned H pylori treatment and among 2.1% of those assigned placebo (hazard ratio [HR] of death = 0.67, 95% CI = 0.36 to 1.28). Garlic and vitamin treatments were associated with non-statistically significant reductions in gastric cancer incidence and mortality. Vitamin treatment was associated with statistically significantly fewer deaths from gastric or esophageal cancer, a secondary endpoint (HR = 0.51, 95% CI = 0.30 to 0.87; P = .014).
0 Communities
1 Members
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27 MeSH Terms
14-day triple, 5-day concomitant, and 10-day sequential therapies for Helicobacter pylori infection in seven Latin American sites: a randomised trial.
Greenberg ER, Anderson GL, Morgan DR, Torres J, Chey WD, Bravo LE, Dominguez RL, Ferreccio C, Herrero R, Lazcano-Ponce EC, Meza-Montenegro MM, Peña R, Peña EM, Salazar-Martínez E, Correa P, Martínez ME, Valdivieso M, Goodman GE, Crowley JJ, Baker LH
(2011) Lancet 378: 507-14
MeSH Terms: 2-Pyridinylmethylsulfinylbenzimidazoles, Adult, Aged, Amoxicillin, Anti-Bacterial Agents, Breath Tests, Clarithromycin, Drug Administration Schedule, Drug Therapy, Combination, Female, Helicobacter Infections, Helicobacter pylori, Humans, Lansoprazole, Latin America, Male, Metronidazole, Middle Aged, Proton Pump Inhibitors, Time Factors, Treatment Outcome, Urea
Show Abstract · Added May 18, 2016
BACKGROUND - Evidence from Europe, Asia, and North America suggests that standard three-drug regimens of a proton-pump inhibitor plus amoxicillin and clarithromycin are significantly less effective for eradication of Helicobacter pylori infection than are 5-day concomitant and 10-day sequential four-drug regimens that include a nitroimidazole. These four-drug regimens also entail fewer antibiotic doses than do three-drug regimens and thus could be suitable for eradication programmes in low-resource settings. Few studies in Latin America have been done, where the burden of H pylori-associated diseases is high. We therefore did a randomised trial in Latin America comparing the effectiveness of four-drug regimens given concomitantly or sequentially with that of a standard 14-day regimen of triple therapy.
METHODS - Between September, 2009, and June, 2010, we did a randomised trial of empiric 14-day triple, 5-day concomitant, and 10-day sequential therapies for H pylori in seven Latin American sites: Chile, Colombia, Costa Rica, Honduras, Nicaragua, and Mexico (two sites). Participants aged 21-65 years who tested positive for H pylori by a urea breath test were randomly assigned by a central computer using a dynamic balancing procedure to: 14 days of lansoprazole, amoxicillin, and clarithromycin (standard therapy); 5 days of lansoprazole, amoxicillin, clarithromycin, and metronidazole (concomitant therapy); or 5 days of lansoprazole and amoxicillin followed by 5 days of lansoprazole, clarithromycin, and metronidazole (sequential therapy). Eradication was assessed by urea breath test 6-8 weeks after randomisation. The trial was not masked. Our primary outcome was probablity of H pylori eradication. Our analysis was by intention to treat. This trial is registered with ClinicalTrials.gov, registration number NCT01061437.
FINDINGS - 1463 participants aged 21-65 years were randomly allocated a treatment: 488 were treated with 14-day standard therapy, 489 with 5-day concomitant therapy, and 486 with 10-day sequential therapy. The probability of eradication with standard therapy was 82·2% (401 of 488), which was 8·6% higher (95% adjusted CI 2·6-14·5) than with concomitant therapy (73·6% [360 of 489]) and 5·6% higher (-0·04% to 11·6) than with sequential therapy (76·5% [372 of 486]). Neither four-drug regimen was significantly better than standard triple therapy in any of the seven sites.
INTERPRETATION - Standard 14-day triple-drug therapy is preferable to 5-day concomitant or 10-day sequential four-drug regimens as empiric therapy for H pylori infection in diverse Latin American populations.
FUNDING - Bill & Melinda Gates Foundation, US National Institutes of Health.
Copyright © 2011 Elsevier Ltd. All rights reserved.
0 Communities
1 Members
0 Resources
22 MeSH Terms
Effect of Helicobacter pylori eradication on gastric carcinogenesis.
Romero-Gallo J, Harris EJ, Krishna U, Washington MK, Perez-Perez GI, Peek RM
(2008) Lab Invest 88: 328-36
MeSH Terms: 2-Pyridinylmethylsulfinylbenzimidazoles, Adenocarcinoma, Amoxicillin, Animals, Animals, Outbred Strains, Anti-Bacterial Agents, Clarithromycin, Disease Models, Animal, Drug Administration Schedule, Drug Therapy, Combination, Gastritis, Gerbillinae, Helicobacter Infections, Helicobacter pylori, Interferon-gamma, Lansoprazole, Male, Specific Pathogen-Free Organisms, Stomach Neoplasms, Time Factors
Show Abstract · Added March 5, 2014
Chronic gastritis induced by Helicobacter pylori is the strongest known risk factor for gastric adenocarcinoma, yet the effects of bacterial eradication on carcinogenesis remain unclear. Animal models provide important insights into factors that are involved in gastric carcinogenesis, and we previously utilized such a model to demonstrate that an in vivo-adapted H. pylori strain, 7.13, rapidly and reproducibly induces inflammation-mediated gastric carcinoma. In the current study, we used this bacterial strain as a prototype to define the role of targeted antimicrobial therapy in gastric carcinogenesis. Mongolian gerbils were infected with H. pylori for 4 or 8 weeks, treated with antimicrobial agents or vehicle, and then euthanized at 8 weeks after the completion of therapy. All infected gerbils developed gastritis; however, inflammation was significantly attenuated in animals receiving antimicrobial therapy. Gastric dysplasia or cancer developed in >60% of the gerbils that remained persistently colonized with H. pylori, but in none of the animals treated with antibiotics following 4 weeks of infection. Infection with H. pylori for 8 weeks prior to therapy resulted in an attenuation, but not complete prevention, of pre-malignant and malignant lesions. Similarly, antibiotic therapy initiated at 4, but not 8, weeks after H. pylori challenge significantly reduced expression of the Th1 pro-inflammatory cytokine interferon-gamma within colonized gastric mucosa. These results indicate that treatment of H. pylori in this model decreases the incidence and severity of lesions with carcinogenic potential. The effectiveness of eradication is dependent upon the timing of intervention, providing insights into mechanisms that may regulate the development of malignancies arising within the context of inflammatory states.
0 Communities
2 Members
0 Resources
20 MeSH Terms
Effect of glycine on Helicobacter pylori in vitro.
Minami M, Ando T, Hashikawa SN, Torii K, Hasegawa T, Israel DA, Ina K, Kusugami K, Goto H, Ohta M
(2004) Antimicrob Agents Chemother 48: 3782-8
MeSH Terms: Amoxicillin, DNA, Bacterial, Glycine, Helicobacter pylori, Microbial Sensitivity Tests, Mutation, Penicillins
Show Abstract · Added October 15, 2015
Glycine is the simplest amino acid and is used as a metabolic product in some bacteria. However, an excess of glycine inhibits the growth of many bacteria, and it is used as a nonspecific antiseptic agent due to its low level of toxicity in animals. The effect of glycine on Helicobacter pylori is not precisely known. The present study was conducted to investigate (i) the effect of glycine on clarithromycin (CLR)-resistant and -susceptible strains of H. pylori, (ii) the effect of glycine in combination with amoxicillin (AMX), and (iii) the postantibiotic effect (PAE). The MIC at which 90% of strains are inhibited for glycine was almost 2.5 mg/ml for 31 strains of H. pylori, including CLR-resistant strains. We constructed isogenic CLR-resistant mutant strains by natural transformation and investigated the difference between clinical wild-type strains and isogenic mutants. There were no differences in the MICs between CLR-resistant and -susceptible strains or between clinical wild-type and mutant strains. The combination of AMX and glycine showed synergistic activity, with the minimum bactericidal concentration of AMX with glycine decreasing to 1/10 that of AMX alone. Glycine showed no PAE against H. pylori. These results suggest that glycine may be a useful antimicrobial agent against H. pylori not only alone but also in combination with antibacterial drugs for the treatment of H. pylori-associated diseases. Glycine may represent a component of a new type of eradication therapy for CLR-resistant H. pylori.
0 Communities
1 Members
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7 MeSH Terms
Oral erythromycin and the risk of sudden death from cardiac causes.
Ray WA, Murray KT, Meredith S, Narasimhulu SS, Hall K, Stein CM
(2004) N Engl J Med 351: 1089-96
MeSH Terms: Administration, Oral, Adult, Aged, Amoxicillin, Anti-Bacterial Agents, Aryl Hydrocarbon Hydroxylases, Calcium Channel Blockers, Confounding Factors (Epidemiology), Cytochrome P-450 CYP3A, Death, Sudden, Cardiac, Diltiazem, Drug Interactions, Erythromycin, Female, Humans, Male, Middle Aged, Multivariate Analysis, Nitroimidazoles, Oxidoreductases, N-Demethylating, Risk, Troleandomycin, Verapamil
Show Abstract · Added December 10, 2013
BACKGROUND - Oral erythromycin prolongs cardiac repolarization and is associated with case reports of torsades de pointes. Because erythromycin is extensively metabolized by cytochrome P-450 3A (CYP3A) isozymes, commonly used medications that inhibit the effects of CYP3A may increase plasma erythromycin concentrations, thereby increasing the risk of ventricular arrhythmias and sudden death. We studied the association between the use of erythromycin and the risk of sudden death from cardiac causes and whether this risk was increased with the concurrent use of strong inhibitors of CYP3A.
METHODS - We studied a previously identified Tennessee Medicaid cohort that included 1,249,943 person-years of follow-up and 1476 cases of confirmed sudden death from cardiac causes. The CYP3A inhibitors used in the study were nitroimidazole antifungal agents, diltiazem, verapamil, and troleandomycin; each doubles, at least, the area under the time-concentration curve for a CYP3A substrate. Amoxicillin, an antimicrobial agent with similar indications but which does not prolong cardiac repolarization, and former use of erythromycin also were studied, to assess possible confounding by indication.
RESULTS - The multivariate adjusted rate of sudden death from cardiac causes among patients currently using erythromycin was twice as high (incidence-rate ratio, 2.01; 95 percent confidence interval, 1.08 to 3.75; P=0.03) as that among those who had not used any of the study antibiotic medications. There was no significant increase in the risk of sudden death among former users of erythromycin (incidence-rate ratio, 0.89; 95 percent confidence interval, 0.72 to 1.09; P=0.26) or among those who were currently using amoxicillin (incidence-rate ratio, 1.18; 95 percent confidence interval, 0.59 to 2.36; P=0.65). The adjusted rate of sudden death from cardiac causes was five times as high (incidence-rate ratio, 5.35; 95 percent confidence interval, 1.72 to 16.64; P=0.004) among those who concurrently used CYP3A inhibitors and erythromycin as that among those who had used neither CYP3A inhibitors nor any of the study antibiotic medications. In contrast, there was no increase in the risk of sudden death among those who concurrently used amoxicillin and CYP3A inhibitors or those currently using any of the study antibiotic medications who had formerly used CYP3A inhibitors.
CONCLUSIONS - The concurrent use of erythromycin and strong inhibitors of CYP3A should be avoided.
Copyright 2004 Massachusetts Medical Society
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3 Members
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23 MeSH Terms
Ciprofloxacin and amoxicillin as continuation treatment of febrile neutropenia in pediatric cancer patients.
Park JR, Coughlin J, Hawkins D, Friedman DL, Burns JL, Pendergrass T
(2003) Med Pediatr Oncol 40: 93-8
MeSH Terms: Administration, Oral, Ambulatory Care, Amoxicillin, Antineoplastic Agents, Blood Cell Count, Child, Ciprofloxacin, Drug Therapy, Combination, Feasibility Studies, Female, Fever, Humans, Male, Neoplasms, Neutropenia, Treatment Outcome
Show Abstract · Added March 27, 2014
BACKGROUND - The empiric administration of anti-microbial therapy significantly reduces the morbidity and mortality associated with febrile neutropenic episodes in oncology patients. Outpatient empiric antibiotic therapy can be safely administered to a subset of febrile neutropenic patients at low risk for clinical complications.
PROCEDURE - Pediatric cancer patients presenting with febrile neutropenia after non-myeloablative chemotherapy and who met institutional criteria for early hospital discharge following a minimum of 48-hr inpatient empiric intravenous ceftazidime were eligible for the study. The feasibility and efficacy of an outpatient continuation therapy of oral ciprofloxacin (CPR) 25-30 mg/kg/day divided BID and amoxicillin (AMX) 30-50 mg/kg/day divided TID was assessed.
RESULTS - Thirty febrile neutropenic episodes in 26 patients were treated with outpatient oral CPR/AMX therapy. Oral CPR/AMX therapy was feasible in 28 (93%) and efficacious in 26 (87%) of treatment episodes. CPR/AMX was discontinued due to abdominal pain and diarrhea (n = 2), recurrent fever (n = 3), or gastrointestinal bleeding (n = 1). No patient developed new bacteremia or cardiopulmonary decompensation. Bone/joint pain or gastrointestinal symptoms occurred in 27% of treatment episodes. Duration of neutropenia, lower absolute neutrophil count (ANC) (< 100/mm(3)) at start of oral antibiotic therapy and active malignant disease were associated with failure of oral antibiotic therapy.
CONCLUSIONS - It is feasible to administer oral CPR/AMX as continuation antibiotic therapy for a selected subgroup of febrile neutropenic episodes defined after initial hospitalization and empiric antibiotic therapy. Prospectively randomized trials will be required to analyze adequately the efficacy of an oral CPR/AMX outpatient antibiotic regimen for treatment of febrile neutropenia in pediatric oncology patients.
Copyright 2003 Wiley-Liss, Inc.
0 Communities
1 Members
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16 MeSH Terms
Outcomes of children treated for Lyme disease.
Wang TJ, Sangha O, Phillips CB, Wright EA, Lew RA, Fossel AH, Fossel K, Shadick NA, Liang MH, Sundel RP
(1998) J Rheumatol 25: 2249-53
MeSH Terms: Administration, Oral, Amoxicillin, Antibodies, Bacterial, Borrelia burgdorferi Group, Child, Child Behavior, Child, Preschool, Cohort Studies, Electrocardiography, Follow-Up Studies, Humans, Injections, Intravenous, Lyme Disease, Penicillins, Recurrence, Reference Values, Surveys and Questionnaires, Treatment Outcome
Show Abstract · Added April 15, 2014
OBJECTIVE - To study the outcome of Lyme disease (LD) in children identified in a total population survey of an endemic island.
METHODS - We conducted a population-based retrospective cohort study off the coast of Massachusetts. Twenty-five children who met the Centers for Disease Control case definition for prior LD were compared with 26 children without LD from the same community. All children with LD received antibiotics during the acute phase of their disease. All 51 children were invited for a clinical evaluation, including 12-lead electrocardiogram (EKG), and measurement of antibodies to Borrelia burgdorferi by antibody-capture ELISA and Western blot.
RESULTS - At a mean of 3.2 years from the initial manifestation of LD, children with prior LD did not have a higher prevalence of musculoskeletal or neurological symptoms, examination abnormalities, abnormal EKG, or behavioral difficulties, compared to children with no history of LD.
CONCLUSION - Children who receive appropriate antimicrobial therapy for LD appear to have no demonstrable longterm morbidity.
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18 MeSH Terms