Publications by authors named "Alfredo Ponce De Leon"

We describe two cases of possible healthcare-associated mucormycosis in liver transplant recipients. Mucorales may be acquired from environmental sources such as contaminated medical equipment, grafts or procedure related. Gastrointestinal mucormycosis is the second most common presentation in healthcare-associated infections.

View Article and Find Full Text PDF

Background: Infections due to carbapenem-resistant Gram-negative bacteria are emerging as an important challenge in health-care settings and a growing concern worldwide. Lateral flow immunoassay NG-Test CARBA 5 can detect the five most reported carbapenemases (KPC, OXA-48-like, VIM, IMP, and NDM). Direct testing of positive blood cultures could reduce time to detection.

View Article and Find Full Text PDF
Article Synopsis
  • This study investigated febrile neutropenia (FN) in Mexican adults with acute leukemia undergoing chemotherapy, revealing that 74 out of 95 patients experienced FN episodes.
  • The majority of FN cases had a clear infection source, with urinary tract infections, bacterial sinusitis, and pneumonia being the most prevalent, and Gram-negative bacteria identified as the leading pathogens.
  • Antimicrobial prophylaxis significantly reduced the risk of FN, while invasive fungal infections were linked to higher mortality rates within 30 days.
View Article and Find Full Text PDF

Objectives: The use of cephalosporins combined with clavulanate for the treatment of ESBL-harbouring Enterobacteriaceae has been scarcely described. We aimed to describe the effect of different concentrations of clavulanate in the MIC of cefixime and ceftibuten of ESBL-producing Escherichia coli and Klebsiella pneumoniae.

Methods: ESBL-producing E.

View Article and Find Full Text PDF

The metagenomic surveillance of antimicrobial resistance in wastewater has been suggested as a methodological tool to characterize the distribution, status, and trends of antibiotic-resistant bacteria. In this study, a cross-sectional collection of samples of hospital-associated raw and treated wastewater were obtained from February to March 2020. Shotgun metagenomic sequencing and bioinformatic analysis were performed to characterize bacterial abundance and antimicrobial resistance gene analysis.

View Article and Find Full Text PDF

The incidence and distribution of coccidioidomycosis are increasing. Information scarcity is evident in Mexico, particularly in non-endemic zones and specific populations. We compared the treatment and outcomes for patients with isolated pulmonary infections and those with disseminated coccidioidomycosis, including mortality rates within six weeks of diagnosis.

View Article and Find Full Text PDF

Histoplasmosis is an endemic and invasive mycosis caused by . We conducted a retrospective study comparing immunosuppressed patients without human immunodeficiency virus (HIV) with a historical cohort of people with HIV and histoplasmosis. We included 199 patients with proven or probable histoplasmosis, of which 25.

View Article and Find Full Text PDF

The objective of the study was to detect multidrug-resistant sp. and sp. isolates in municipal and hospital wastewater and to determine their elimination or persistence after wastewater treatment.

View Article and Find Full Text PDF

Background: Even though worldwide death rates from coronavirus disease 2019 (COVID-19) have decreased, the threat of disease progression and death for high-risk groups continues. Few direct comparisons between the available severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antivirals have been made.

Objective: We aimed to compare two SARS-CoV-2 antivirals (nirmatrelvir/ritonavir and remdesivir) against all-cause hospitalization or death.

View Article and Find Full Text PDF

Background: First-line treatments for methicillin-susceptible (MSSA) bacteraemia are nafcillin, oxacillin, or cefazolin. Regional shortages of these antibiotics force clinicians to use other options like dicloxacillin and cephalotin. This study aims to describe and compare the safety and efficacy of cephalotin and dicloxacillin for the treatment of MSSA bacteraemia.

View Article and Find Full Text PDF

Unlabelled: This exploratory analysis assessed the incidence of respiratory viral coinfections and their impact on clinical outcomes in non-hospitalized adults with mild-to-moderate coronavirus disease-2019 (COVID-19) treated with molnupiravir versus placebo for 5 days in the Phase 2/3 MOVe-OUT trial (NCT04575597), which took place in October 2020 to January 2021 (Phase 2, = 302) and May 2021 to October 2021 (Phase 3, = 1,433). Among 1,735 total randomized participants, 1,674 had a baseline respiratory pathogen panel (NxTAG Respiratory Pathogen Panel for the Luminex MAGPIX instrument) performed and 69 (4.1%) were coinfected with at least one additional respiratory viral pathogen.

View Article and Find Full Text PDF

Background: This case series of 5 patients with severely necrotic mpox highlights the predominantly necrotic nature of lesions seen in cases of severe mpox as shown by skin and lung biopsy, as well as the extensive dissemination of the infection, as shown by polymerase chain reaction (PCR) assessment in different body sites.

Case Presentations: Patients were male, the median age was 37, all lived with HIV (2 previously undiagnosed), the median CD4 cell count was 106 cells/mm, and 2/5 were not receiving antiretroviral treatment. The most common complication was soft tissue infection.

View Article and Find Full Text PDF

Background And Objective: A double-blind phase 3 study was conducted to compare posaconazole 300 mg intravenously (IV)/300 mg orally once daily (twice daily day 1) with voriconazole 4 mg/kg IV twice daily/200 mg orally twice daily (6 mg/kg day 1) for treatment of invasive aspergillosis. This analysis was conducted to summarize the pharmacokinetics and exposure-response relationships of posaconazole and voriconazole using plasma trough concentration (C) as a surrogate for exposure from the double-blind phase 3 study.

Methods: The pharmacokinetic evaluable population included all intention-to-treat (ITT) participants with at least one plasma concentration during the treatment period.

View Article and Find Full Text PDF
Article Synopsis
  • Tuberculosis (TB) is increasing among people with diabetes mellitus (DM), especially in lower-resource countries.
  • A trial in Mexico City tested TB preventive treatments using isoniazid (INH) and rifampicin (RIF) in individuals with type 2 DM, involving 130 participants.
  • The study was halted due to safety concerns; while the overall adverse event rates were similar, more participants on INH faced serious liver issues, while those on RIF had severe gastrointestinal problems, suggesting that neither treatment is safe enough for routine use in this population.
View Article and Find Full Text PDF

Introduction: Infections caused by carbapenem-resistant Gram-negative bacteria (CR-GNB) are a significant cause of mortality and represent a serious challenge to health systems. The early identification of mortality predictors could guide appropriate treatment and follow-up. We aimed to identify the factors associated with 90-day all-cause mortality in patients with CR-GNB infections.

View Article and Find Full Text PDF

Recognition of risk factors for hospital-acquired infections (HAI) in patients with COVID-19 is warranted. We aimed to describe factors associated with the development of HAI in patients with severe COVID-19. We conducted a retrospective cohort study including all adult patients admitted with severe COVID-19 between March 2020 and November 2020.

View Article and Find Full Text PDF

Introduction: Post-COVID-19 syndrome (PCS) usually occurs 3 months after the onset of COVID-19 with a symptom duration of at least 2 months without an alternative diagnosis.

Objective: This study aimed to describe the prevalence, characteristics, and impact on the quality of life (QoL) of post-COVID-19 syndrome in patients with a history of hospitalization for COVID-19.

Materials And Methods: We conducted a cross-sectional study.

View Article and Find Full Text PDF
Article Synopsis
  • Invasive Fungal Infections (IFI) are emerging complications in critically ill COVID-19 patients, with a prevalence of 9.3% found in this study.
  • The study, conducted in an ICU, identified related factors influencing IFIs, such as higher SOFA scores and the use of empirical antibiotics, particularly in cases of COVID-19-associated pulmonary aspergillosis (CAPA).
  • Despite a high prevalence of IFIs and significant mortality rates, there was no mortality difference observed among patients with these infections compared to matched controls.
View Article and Find Full Text PDF

Immunocompromised patients are at risk of opportunistic infections. This is a 67-year-old woman with systemic sclerosis and knee osteoarthritis who underwent left total knee arthroplasty in 2009. In 2018 she underwent surgery for presumed aseptic loosening.

View Article and Find Full Text PDF

Background: Mycobacterium tuberculosis genotyping has been crucial to determining the distribution and impact of different families on disease clinical presentation. The aim of the study was to evaluate the associations among sociodemographic and clinical characteristics and M. tuberculosis lineages from patients with pulmonary tuberculosis in Orizaba, Veracruz, Mexico.

View Article and Find Full Text PDF
Article Synopsis
  • The study aimed to analyze the genomic features and molecular epidemiology of carbapenem-resistant bacteria like Klebsiella pneumoniae, Escherichia coli, Acinetobacter baumannii, and Pseudomonas aeruginosa in Mexico using whole genome sequencing and bioinformatics tools.
  • Clinical isolates were collected from 28 medical centers, and various genetic resistance and virulence factors were identified in these bacteria, indicating a significant presence of resistance genes across the studied strains.
  • The findings highlight the prevalence of multiple resistance genes in the tested bacteria, suggesting urgent attention is needed for managing antibiotic resistance in clinical settings in Mexico.
View Article and Find Full Text PDF

Background: Antimicrobial resistance is a global concern. Analysis of sterile fluids is essential because microorganisms are defined as significant in most cases. Blood, cerebrospinal, and pleural fluids are frequently received in the microbiology lab because they are associated with considerable rates of morbi-mortality.

View Article and Find Full Text PDF

In this study, we report the carbapenemase-encoding genes and colistin resistance in , , , and in the second year of the COVID-19 pandemic. Clinical isolates included carbapenem-resistant , carbapenem-resistant , carbapenem-resistant , and carbapenem-resistant . Carbapenemase-encoding genes were detected by PCR.

View Article and Find Full Text PDF

Abstract: Fresh cheeses and cream are important garnishes of traditional Mexican food, often purchased at street or itinerant open markets or tianguis. However, there is scarce information regarding the microbiological quality of cheeses and cream sold in tianguis. For 2 years, three dairy stalls from three tianguis in Mexico City were visited once each season, trading practices were registered, and 96 dairy products were purchased.

View Article and Find Full Text PDF