Publications by authors named "Arthur W Baker"

Article Synopsis
  • EBV DNAemia surveillance is used to prevent post-transplant lymphoproliferative disorder (PTLD) in lung transplant recipients (LTRs), but its effectiveness in adult seropositive patients is unclear.
  • A study analyzed EBV viral loads in seropositive LTRs and compared levels between those who developed PTLD and those who didn't, revealing that peak viral loads were only significantly higher after PTLD was suspected.
  • The study found low positive predictive values (PPVs) for moderate (14.7%) and high-grade (33.3%) EBV DNAemia in indicating risk for future PTLD, suggesting improved diagnostic approaches are needed.
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Article Synopsis
  • Belatacept is used to prevent rejection in lung transplant patients, but the infection risks associated with its use haven't been thoroughly studied.
  • A retrospective study analyzed infections in 52 lung transplant recipients treated with belatacept from 2011 to 2022, revealing significant rates of viral and bacterial infections, particularly cytomegalovirus (CMV).
  • The findings highlight the need for collaborative research to further investigate infection risks and management strategies for lung transplant recipients receiving belatacept.
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Mycoplasma hominis and Ureaplasma species are urogenital mollicutes that can cause serious donor-derived infections in lung transplant recipients. Best practices for mollicute screening remain unknown. We conducted a single-center prospective study analyzing lung transplants performed from October 5, 2020, to September 25, 2021, whereby donor and recipient bronchoalveolar lavage (BAL) samples obtained at time of transplant underwent mollicute screening via culture and polymerase chain reaction (PCR).

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Article Synopsis
  • - Researchers studied maribavir (MBV) to treat 15 cases of difficult-to-treat cytomegalovirus infections in 13 solid organ transplant patients.
  • - Nearly half of the treatment episodes (47%) faced failure because of new MBV resistance or virus returning soon after stopping the medication.
  • - On the positive side, 40% of the treatment episodes resulted in sustained viral clearance, meaning the virus was eliminated effectively.*
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Background: Infectious diseases (ID) physicians are increasingly faced with the challenge of caring for patients with terminal illnesses or incurable infections.

Methods: This was a retrospective cohort of all patients with an ID consult within an academic health system from 1 January 2014 through 31 December 2023, including community, general, and transplant ID consult services.

Results: There were 60 820 inpatient ID consults (17 235 community, 29 999 general, and 13 586 transplant) involving 37 848 unique patients.

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Background: Urinary tract infections (UTI) affect approximately 250 million people annually worldwide. Patients often experience a cycle of antimicrobial treatment and recurrent UTI (rUTI) that is thought to be facilitated by a gut reservoir of uropathogenic (UPEC).

Methods: 125 patients with UTI caused by an antibiotic-resistant organism (ARO) were enrolled from July 2016 to May 2019 in a longitudinal, multi-center cohort study.

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Article Synopsis
  • The study aimed to explore how the concentration of chlorhexidine gluconate (CHG) on the skin affects microbial colonization, particularly in adult patients in medical ICUs across several hospitals.
  • By collecting skin swab samples and measuring CHG concentration, researchers found that higher CHG levels correlated with fewer detections of gram-positive bacteria and specific species, while gram-negative bacteria were less affected.
  • The findings suggest that increasing CHG skin concentrations could enhance infection control for certain pathogens, although no specific threshold level was identified for reducing microbial detection.
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Background: Lung transplant recipients are at increased risk of complex (MABC) acquisition and invasive infection. We analyzed risk factors and outcomes of early post-lung transplant MABC acquisition.

Methods: We conducted a retrospective matched case-control study of patients who underwent lung transplant from 1/1/2012 to 12/31/2021 at a single large tertiary care facility.

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We identified 23 cases of respiratory acquisition linked to a colonized plumbing system at a new hospital addition. We conducted a genomic and epidemiologic investigation to assess for clonal acquisition of from hospital water sources and improve understanding of genetic distances between isolates. We performed whole-genome sequencing on 28 .

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Background: Various water-based heater-cooler devices (HCDs) have been implicated in nontuberculous mycobacteria outbreaks. Ongoing rigorous surveillance for healthcare-associated (HA-Mab) put in place following a prior institutional outbreak of alerted investigators to a cluster of 3 extrapulmonary infections among patients who had undergone cardiothoracic surgery.

Methods: Investigators convened a multidisciplinary team and launched a comprehensive investigation to identify potential sources of in the healthcare setting.

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is a rapidly growing nontuberculous mycobacteria species that can cause healthcare-associated infections. We report the complete genome of C14-1.MIM, isolated via culture of a respiratory specimen obtained from a hospitalized lung transplant recipient.

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Objective: To assess whether measurement and feedback of chlorhexidine gluconate (CHG) skin concentrations can improve CHG bathing practice across multiple intensive care units (ICUs).

Design: A before-and-after quality improvement study measuring patient CHG skin concentrations during 6 point-prevalence surveys (3 surveys each during baseline and intervention periods).

Setting: The study was conducted across 7 geographically diverse ICUs with routine CHG bathing.

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Mollicute infections, caused by Mycoplasma and Ureaplasma species, are serious complications after lung transplantation; however, understanding of the epidemiology and outcomes of these infections remains limited. We conducted a single-center retrospective study of 1156 consecutive lung transplants performed from 2010-2019. We used log-binomial regression to identify risk factors for infection and analyzed clinical management and outcomes.

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Background: Living kidney donation is possible for people living with HIV (PLWH) in the United States within research studies under the HIV Organ Policy Equity (HOPE) Act. There are concerns that donor nephrectomy may have an increased risk of end-stage renal disease (ESRD) in PLWH due to HIV-associated kidney disease and antiretroviral therapy (ART) nephrotoxicity. Here we report the first 3 cases of living kidney donors with HIV under the HOPE Act in the United States.

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Article Synopsis
  • * A review of patient records from a hospital outbreak found that 10 OHT recipients and 7 VAD patients developed infections, with significant differences in the time to first positive culture after surgery (106 days for OHT vs. 29 days for VAD).
  • * Despite aggressive treatment, including lengthy antimicrobial therapy and multiple surgeries, these patients faced high rates of complications and only 47% survived beyond 12 weeks post-diagnosis. *
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Rationale: Nontuberculous mycobacterial (NTM) diseases are difficult-to-treat infections, especially in lung transplant (LTx) candidates. Currently, there is a paucity of recommendations on the management of NTM infections in LTx, focusing on complex (MAC), and .

Methods: Pulmonologists, infectious disease specialists, LTx surgeons and Delphi experts with expertise in NTM were recruited.

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Background: Nontuberculous mycobacteria (NTM) are emerging pathogens increasingly implicated in healthcare facility-associated (HCFA) infections and outbreaks. We analyzed the performance of statistical process control (SPC) methods in detecting HCFA NTM outbreaks.

Methods: We retrospectively analyzed 3 NTM outbreaks that occurred from 2013 to 2016 at a tertiary care hospital.

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Background: Traditional approaches for surgical site infection (SSI) surveillance have deficiencies that delay detection of SSI outbreaks and other clinically important increases in SSI rates. We investigated whether use of optimised statistical process control (SPC) methods and feedback for SSI surveillance would decrease rates of SSI in a network of US community hospitals.

Methods: We conducted a stepped wedge cluster randomised trial of patients who underwent any of 13 types of common surgical procedures across 29 community hospitals in the Southeastern United States.

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Objectives: To describe the epidemiology of complex colon surgical procedures (COLO), stratified by present at time of surgery (PATOS) surgical-site infections (SSIs) and non-PATOS SSIs and their impact on the epidemiology of colon-surgery SSIs.

Design: Retrospective cohort study.

Methods: SSI data were prospectively collected from patients undergoing colon surgical procedures (COLOs) as defined by the National Healthcare Safety Network (NHSN) at 34 community hospitals in the southeastern United States from January 2015 to June 2019.

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Coinfections are more common in patients with cystic fibrosis and bronchiectasis. Infiltrates on imaging studies are seen more commonly in patients with coinfections, but coinfections did not affect treatment outcomes of pulmonary complex.

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Objective: Sparse recent data are available on the epidemiology of surgical site infections (SSIs) in community hospitals. Our objective was to provide updated epidemiology data on complex SSIs in community hospitals and to characterize trends of SSI prevalence rates over time.

Design: Retrospective cohort study.

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Early in the pandemic of coronavirus disease 2019 (COVID-19), face masks were used extensively by the general public in several Asian countries. The lower transmission rate of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in Asian countries compared with Western countries suggested that the wider community use of face masks has the potential to decrease transmission of SARS-CoV-2. A risk assessment model named Susceptible, Exposed, Infectious, Recovered (SEIR) model is used to quantitatively evaluate the potential impact of community face masks on SARS-CoV-2 reproduction number (R ) and peak number of infectious persons.

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Large-scale genomic studies have identified within-host adaptation as a hallmark of bacterial infections. However, the impact of physiological, metabolic, and immunological differences between distinct niches on the pathoadaptation of opportunistic pathogens remains elusive. Here, we profile the within-host adaptation and evolutionary trajectories of 976 isolates representing 119 lineages of uropathogenic Escherichia coli (UPEC) sampled longitudinally from both the gastrointestinal and urinary tracts of 123 patients with urinary tract infections.

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Objectives: The coronavirus disease 2019 (COVID-19) pandemic has disproportionately afflicted vulnerable populations. Older adults, particularly residents of nursing facilities, represent a small percentage of the population but account for 40% of mortality from COVID-19 in the United States. Racial and ethnic minority individuals, particularly Black, Hispanic, and Indigenous Americans have experienced higher rates of infection and death than the White population.

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