Publications by authors named "Mark Melzer"

Background: New dosing regimens for ceftriaxone 4 g/24 hours and ceftazidime 3 g/12 hours are convenient for patients receiving OPAT. To date, these have not been clinically validated.

Aim: To assess the tolerability, toxicity and effectiveness of once daily ceftriaxone (4 g) and 12 hourly ceftazidime regimens (3 g twice a day) in the OPAT setting.

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Objectives: To investigate the clinical, microbiological characteristics and outcomes of patients with bloodstream infections (BSI) due to carbapenemase-producing Enterobacterales (CPE).

Methods: A multicentre retrospective observational study of patients with BSIs due to CPE admitted to six UK hospitals was conducted between 2011 and 2021. Multivariate analysis was used to identify factors predicting 30-day case fatality rate (CFR).

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Introduction: Until recently, healthcare-associated bacteraemia was a neglected area of infection prevention and control (IPC), despite a 30-day mortality of 15-20%. Recently, the UK Department of Health (DH) introduced a target to reduce hospital-acquired bacteraemias by 50% over a five-year period. Following implementation of multifaceted and multidisciplinary interventions, the aim of this study was to determine its impact on achieving this target.

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Objectives: To characterise and describe the diagnostic utility of Endobronchial ultrasound-transbronchial needle aspiration (EBUS-TBNA) in intrathoracic tuberculosis in a cohort of patients with mediastinal lymphadenopathy of unknown aetiology.

Methods: Consecutive patients with intrathoracic lymphadenopathy undergoing EBUS-TBNA between 2012 and 2016 were identified. Demographic data, biopsy cytopathology and mycobacteriology results, HIV and vitamin D status, susceptibility results and final diagnoses were recorded.

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Background: Seasonal influenza is an annual occurrence that leads to large community outbreaks and increased hospitalization. A number of studies have suggested that influenza A (FLUAV) is associated with increased rates of hospitalization and mortality compared with influenza B (FLUBV). This study compared demographic and clinical variables in patients diagnosed with FLUAV or FLUBV during the 2017-2018 UK Influenza season.

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Annual outbreaks of seasonal influenza cause a substantial health burden. The aim of this study was to compare patient demographic/clinical data in two influenza patient groups presenting to hospital; those requiring O or critical care admission and those requiring less intensive treatment. The study was conducted from 1 December 2017 until 1 April 2019 at a district general hospital in East London.

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Introduction: The adoption of the International Society for Peritoneal Dialysis guideline of using mupirocin ointment has been limited by fear of developing mupirocin-resistant organisms. We performed a surveillance program of a large peritoneal dialysis (PD) unit.

Methods: We performed 1,175 surveillance swabs from anterior nares, PD catheter exit site, groin, and axilla, from 240 patients.

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Article Synopsis
  • A case-control study was conducted to investigate the relationship between diabetes and Strongyloides stercoralis seropositivity in a UK population from 2013 to 2016.
  • Out of 532 samples tested, 100 (22.3%) were positive for Strongyloides, with higher rates found among older males, migrants, those with eosinophilia, and diabetic patients.
  • The study found a significant association between diabetes and Strongyloides seropositivity, suggesting a possible link that warrants further investigation.
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We present a rare case of Shigella flexneri bacteraemia and toxic megacolon, and discuss the challenges of conventional laboratory techniques versus molecular PCR platforms in differentiating between Shigella species and Escherichia coli.

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Background And Aim: In 2017, National Health Service Improvement set a 10% reduction target for bacteraemia by 2018, followed by a 50% reduction in healthcare-associated Gram-negative bacteraemias by 2022. We analysed consecutive cases of bacteraemia and devised a strategy to achieve these targets.

Methods: From December 2012 to November 2013, demographic, clinical and microbiological data were prospectively collected on all patients with bacteraemia at the Royal London Hospital in East London, UK.

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Background: The clinical and cost-effectiveness of outpatient parenteral antimicrobial therapy (OPAT) services are well described. We used a blood culture database as a novel approach to case finding and determined its utility in identifying inpatients suitable for OPAT.

Methods: From December 2012 to November 2013, consecutive adult inpatients with bacteraemia, and those recruited to OPAT, were prospectively studied.

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Background: There is lack of outcome data for bacteraemic patients on specialist renal units. We described demographic, clinical, microbiological data and outcomes for bacteraemic adult renal transplant and non-transplant patients at a London Teaching Hospital. We also assessed the appropriateness of empirical antibiotic policy.

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The rapid identification of antimicrobial resistance is essential for effective treatment of highly resistant Mycobacterium tuberculosis. Whole-genome sequencing provides comprehensive data on resistance mutations and strain typing for monitoring transmission, but unlike for conventional molecular tests, this has previously been achievable only from cultures of M. tuberculosis.

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Purpose: There is lack of contemporary outcome data on patients with hospital-acquired infections that cause bacteraemia. We determined the risk factors for 7-day mortality and investigated the hypothesis that, compared with central venous catheter (CVC)-associated bacteraemic infections, catheter-associated bacteraemic urinary tract infections (UTIs) were significantly associated with 7-day mortality.

Methods: From October 2007 to September 2008, demographical, clinical and microbiological data were collected on patients with hospital-acquired bacteraemia.

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Purpose: Within the UK, there is lack of contemporary data on clinical outcomes in patients admitted to hospital with severe community acquired infection. The purpose of this study was to determine outcomes and risk factors associated with mortality in consecutive patients admitted to a UK NHS trust with community acquired infections that cause bacteraemia.

Methods: From September 2007 to August 2008, demographic, clinical and microbiological data were collected on patients with laboratory confirmed bacteraemia.

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Objectives: To determine the utility of 'risk assessment' in selecting Mycobacterium tuberculosis isolates for rifampin resistance or rpoB genotyping compared to 'non-selectively' genotyping all isolates. Secondly, we examined the association between past treatment and drug resistance.

Methods: From January 2003 to December 2006, demographic, clinical, and laboratory data were prospectively collected on patients with laboratory-confirmed tuberculosis (TB).

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UK guidance recommends that all patients with falciparum malaria be admitted to hospital, although a number of cohort studies in the developed world demonstrate that outpatient treatment of falciparum malaria is feasible and safe in selected patients. We review the literature on outpatient treatment in developed countries and present local data from East London where a selected immigrant population were successfully treated as outpatients. Although it is premature to claim that outpatient treatment of falciparum malaria is safe in all selected patients, we conclude it is time for a large UK-based safety study or randomised trial to dispel the belief that all patients with uncomplicated Plasmodium falciparum must be admitted to hospital.

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Objectives: To assess the proportion and clinical significance of bacteraemia caused by viridans streptococci (VS) in immunocompetent adults and children.

Methods: Over a 25-month period, we collected data on all patients with VS bacteraemia at a UK district general hospital.

Results: VS caused 50/723 (6.

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We report a case of a 49-year-old male with a history of chronic alcoholism and evidence of a pancreatic pseudocyst on CT scanning. He presented with a 3-days history of fever, loss of appetite and upper abdominal pain. Blood cultures grew Klebsiella pneumoniae and he improved clinically with a seven-day course of intravenous co-amoxiclav and metronidazole.

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Objectives: To determine the differences in mortality and length of hospital stay in patients with bacteraemic infection caused by ESBL and non-ESBL producing Escherichia coli. Main outcome measures were mortality, time from bacteraemia to death and length of inpatient stay.

Methods: From June 2003 to November 2005, we prospectively collected clinical and microbiological data on all adult patients with E.

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