Publications by authors named "Bharat Pokhrel"

Article Synopsis
  • * A study conducted in Nepal identified that 50% of the analyzed P. aeruginosa isolates were multidrug-resistant (MDR), with a substantial percentage producing metallo-β-lactamase (MBL) and a smaller portion showing resistance to colistin.
  • * The research revealed that 94.4% of the MDR strains carried the MexB gene, while 16.7% and 11.2% harbored the carbapenemase gene (bla) and colistin resistance gene
View Article and Find Full Text PDF

Background: Pseudomonas aeruginosa is an opportunistic pathogen, which causes nosocomial infections in human. The rapid increase in drug resistance of this pathogen is a global concern. The aim of this study was to determine the clinical burden of P.

View Article and Find Full Text PDF

causing chronic suppurative otitis media (CSOM) is rare in immunocompetent people; however, it can occur as a significant opportunistic pathogen in immunocompromised patients. Here, in our study, a 53-year-old diabetic patient having a history of CSOM visited the Department of Otorhinolaryngology-Head and Neck Surgery (ENT-HNS), Tribhuvan University and Teaching Hospital (TUTH), Nepal, in March 2016. Although he was on medication with an antibacterial ear drop from the last 10 days, his right ear was presented with otorrhea, pruritus, otalgia, aural fullness, hearing impairment, and tinnitus from the last 3-4 months.

View Article and Find Full Text PDF
Article Synopsis
  • Antimicrobial resistance, especially carbapenem resistance due to the production of various β-lactamases like OXA-48, is a significant issue in healthcare practices.
  • A 56-year-old male with meningoencephalitis developed ventilator-associated pneumonia and had limited antibiotic options due to resistant bacterial isolates, initially treated with colistin and amikacin.
  • Despite improved vital signs, he later relapsed with fever and low blood pressure; tests confirmed that the infecting bacteria produced OXA-48 carbapenemase, rendering them resistant to all available antibiotics.
View Article and Find Full Text PDF

CXXC finger binding protein 1 (CFP-1) is an evolutionarily conserved protein that binds to non-methylated CpG-rich promoters in mammals and Caenorhabditis elegans. This conserved epigenetic regulator is part of the COMPASS complex that contains the H3K4me3 methyltransferase SET1 in mammals and SET-2 in C. elegans.

View Article and Find Full Text PDF
Article Synopsis
  • - Pseudomonas aeruginosa (P. aeruginosa) is a major cause of hospital-acquired infections, with an increasing problem of multidrug resistance (MDR), though its origins and spread aren't fully understood.
  • - Researchers analyzed the genomes of 185 clinical isolates globally, finding that 136 belonged to a prevalent type (ST235) and grouped into seven subclades, each with unique drug resistance genes linked to their geographic locations.
  • - The study indicates that after exposure to antibiotics, clonal expansion drives the population structure of MDR P. aeruginosa, with ST235 showing a higher mutation rate and lacking a specific immune system, helping to explain its dominance as a resistant strain.
View Article and Find Full Text PDF

Background: Patient's medical charts in hospitals are potentially contaminated by pathogenic bacteria and might act as vehicles for transmission of bacterial infections.This study was aimed to determine the rate of contamination of medical charts by multidrug resistant bacteria.

Methods: Sampling of total 250 patient's medical charts from different wards was done with the help of cotton swabs soaked in sterile normal saline.

View Article and Find Full Text PDF
Article Synopsis
  • In a study of 250 clinical isolates collected in Nepal, 38 were found to be resistant to carbapenem antibiotics, specifically imipenem and meropenem, with minimum inhibitory concentrations (MICs) of 4 μg/ml or higher.
  • All 38 resistant isolates contained specific genetic markers associated with antibiotic resistance, including genes for resistance mechanisms.
  • Many of these isolates also possessed 16S rRNA methylase genes, which are known to play a role in modifying ribosomal RNA and contributing to resistance.
View Article and Find Full Text PDF

A total of 11 multidrug-resistant clinical isolates were obtained in Nepal. Four of these isolates harbored genes encoding one or more carbapenemases (DIM-1, NDM-1, and/or VIM-2), and five harbored genes encoding a 16S rRNA methyltransferase (RmtB4 or RmtF2). A novel RmtF variant, RmtF2, had a substitution (K65E) compared with the same gene in RmtF.

View Article and Find Full Text PDF

Background: Candida species are responsible for various clinical infections ranging from mucocutaneous infection to life threatening invasive diseases along with increased resistance to antifungal drugs has made a serious concern. Resistance to antifungal agents has increased during the last decade. Thus, identification of Candida up to species level and its antifungal susceptibility testing has a paramount significance in the management of Candidal infections.

View Article and Find Full Text PDF

Background: Healthcare associated infections (HCAI) and antimicrobial resistance are principal threats to the patients of intensive care units and are the major determining factors for patient outcome. They are associated with increased morbidity, mortality, excess hospitalization and financial costs. The present study is an attempt to investigate the spectrum and antimicrobial resistance of bacterial isolates involved in healthcare associated infections (HCAI) in the patients of a critical care unit at a tertiary care university hospital in Kathmandu, Nepal.

View Article and Find Full Text PDF
Article Synopsis
  • Device-associated health care-acquired infections (DA-HAIs) are significant contributors to illness and costs in intensive care units, particularly affecting patients in Nepal.
  • A study identified three common types of DA-HAIs—ventilator-associated pneumonia (VAP), central line-associated bloodstream infection (CLABSI), and catheter-associated urinary tract infection (CAUTI)—finding a high incidence rate of 27.3 per 1,000 patient-days, with prevalent multidrug-resistant bacteria.
  • The results highlight the urgent need for improved infection control measures, surveillance, and antibiotic management to combat the high rates of DA-HAIs compared to developed countries.
View Article and Find Full Text PDF
Article Synopsis
  • - Rotaviruses are a leading cause of severe diarrhea in children worldwide, resulting in over 500,000 deaths annually, with significant infection rates in Nepal (17.0-39.0% in kids under 5 years).
  • - A study conducted from January to November 2014 found that 22.9% of sampled children tested positive for Rotavirus, with G12 and P6 being the most prevalent genotypes.
  • - The research indicates that Rotavirus infections predominantly affect infants aged 7 to 24 months during winter, highlighting the need for enhanced surveillance and prevention strategies for these unusual genotypes in Nepal.
View Article and Find Full Text PDF

Background: Nocardiosis is an opportunistic infection in a patient with underlying immune suppression and organ transplant. Clinical syndromes are varied and ranges from pulmonary, disseminated, cutaneous along with central nervous system involvement.

Case Presentation: Herein, we report a rare case of disseminated pulmonary nocardiosis with cerebral manifestation in a 66 year-old-Nepali farmer; with a history of renal transplantation and undergoing therapy for pulmonary tuberculosis.

View Article and Find Full Text PDF

A novel PER-type extended-spectrum β-lactamase, PER-8, was identified in an clinical isolate obtained in Nepal. The amino acid sequence of PER-8 has a substitution at position 39 (Gly to Glu) compared with that of PER-7. The / ratio of PER-8 for aztreonam was lower than that of PER-7, while the / ratio of PER-8 for imipenem was higher than that of PER-7.

View Article and Find Full Text PDF

. Superficial mycosis is a common fungal infection worldwide, mainly caused by dermatophytes. However, the prevalence of species varies geographically.

View Article and Find Full Text PDF

Multidrug resistant organisms are increasing day by day and the cause is poorly known. This study was carried out from June 2011 to May 2012 at National Institute of Neurological and Allied Sciences Kathmandu, Nepal, with a view to determining drug resistant pathogens along with detection of extended spectrum β-lactamase (ESBL), AmpC β-lactamase (ABL), and metallo-β-lactamase (MBL) producing bacteria causing infection to ICU patients. A standard methodology was used to achieve these objectives as per recommendation of American Society for Microbiology.

View Article and Find Full Text PDF
Article Synopsis
  • The study investigates the prevalence and genetic characteristics of multidrug-resistant Acinetobacter baumannii strains in a medical setting in Nepal, finding that nearly half of the sampled isolates were MDR.
  • The isolates showed significant resistance to critical antibiotics, especially aminoglycosides and carbapenems, but remained susceptible to colistin and tigecycline.
  • Phylogenetic analysis revealed the presence of multiple clonal complexes, including a novel complex, and highlighted specific resistance genes like armA, bla(NDM-1), and bla(OXA-23/58) in these strains.
View Article and Find Full Text PDF

Serratia marcescens IOMTU115 has a novel 6'-N-aminoglycoside acetyltransferase-encoding gene, aac(6')-Ial. The encoded protein AAC(6')-Ial has 146 amino acids, with 91.8% identity to the amino acid sequence of AAC(6')-Ic in S.

View Article and Find Full Text PDF

A novel New Delhi metallo-β-lactamase, NDM-13, was identified in a carbapenem-resistant Escherichia coli clinical isolate obtained from the urine of a patient in Nepal. The enzymatic activity of NDM-13 against β-lactams was similar to that of NDM-1. However, NDM-13 displayed significantly higher k cat/Km ratios for cefotaxime.

View Article and Find Full Text PDF
Article Synopsis
  • Microbial biofilms are a significant risk for patients with indwelling medical devices (IMDs), making their detection vital for effective treatment.
  • A study analyzed 65 prosthetic samples, identifying bacteria and assessing their antibiotic resistance, revealing that nearly 46% were biofilm producers, notably Klebsiella pneumoniae and Pseudomonas aeruginosa.
  • The tube adherence (TA) method was found to be a cost-effective alternative to the tissue culture plate (TCP) method for biofilm detection, with antibiotic resistance higher in biofilm producers compared to non-producers.
View Article and Find Full Text PDF

Stenotrophomonas maltophilia IOMTU250 has a novel 6'-N-aminoglycoside acetyltransferase-encoding gene, aac(6')-Iak. The encoded protein, AAC(6')-Iak, consists of 153 amino acids and has 86.3% identity to AAC(6')-Iz.

View Article and Find Full Text PDF

A novel New Delhi metallo-β-lactamase variant, NDM-12, was identified in a carbapenem-resistant Escherichia coli clinical isolate obtained from a urine sample from a patient in Nepal. NDM-12 differed from NDM-1 by two amino acid substitutions (M154L and G222D). The enzymatic activities of NDM-12 against β-lactams were similar to those of NDM-1, although NDM-12 showed lower kcat/Km ratios for all β-lactams tested except doripenem.

View Article and Find Full Text PDF

Methicillin-resistant Staphylococcus aureus (MRSA) carrying the important virulence determinant, Panton-Valentine leukocidin (PVL), is an emerging infectious pathogen associated with skin and soft tissue infections as well as life-threatening invasive diseases. In carrying out the first PVL prevalence study in Nepal, we screened 73 nosocomial isolates of S. aureus from 2 tertiary care Nepali hospitals and obtained an overall PVL-positivity rate of 35.

View Article and Find Full Text PDF

Background: Drug-resistant Providencia rettgeri producing metallo-β-lactamase and 16S rRNA methylase has been reported in several countries. We analyzed P. rettgeri clinical isolates with resistance to carbapenems and aminoglycosides in a hospital in Nepal.

View Article and Find Full Text PDF