Publications by authors named "Pinaki Chattopadhyay"

In humans, a wide range of health disorders have been induced due to an imbalanced metabolism and an excess generation of reactive oxygen species (ROS). Different biological properties found in mushrooms seem to be the reason for their customary use as a favourite delicacy. Therefore, exploration of wild edible mushrooms as a source of various biological compounds is gaining much importance today.

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Exchange of antimicrobial resistance genes via mobile genetic elements occur in the gut which can be transferred from mother to neonate during birth. This study is the first to analyse transmissible colistin resistance gene, , in pregnant mothers and neonates. Samples were collected from pregnant mothers (rectal) and septicaemic neonates (rectal and blood) and analysed for the presence of , its transmissibility, genome diversity, and exchange of between isolates within an individual and across different individuals (not necessarily mother-baby pairs).

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Objectives: Presence and dissemination of plasmid-mediated AmpC genes (pAmpCs) have made bacteria cephalosporin-resistant and assessment of their prevalence and diversity is essential. Coexistence of pAmpCs with New Delhi metallo-β-lactamase (bla) has facilitated their spread and NDM interferes with correct pAmpC phenotypic identification.

Methods: Assessment of pAmpCs in different species and sequence types (STs), co-transmission with bla and phenotypic detection were analysed among Klebsiella pneumoniae (n = 256) and Escherichia coli (n = 92) isolated from septicaemic neonates over 13 years.

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Article Synopsis
  • Antimicrobial resistance in neonatal sepsis is increasing in low- and middle-income countries, making treatment difficult due to poorly understood resistance mechanisms that spread between bacteria.
  • The BARNARDS network studied 36,285 neonates from seven LMICs, finding Klebsiella pneumoniae as the leading cause of sepsis, along with several other bacteria.
  • Whole-genome sequencing revealed that many isolated bacteria had multiple antibiotic resistance genes and were resistant to treatments used for neonatal sepsis, highlighting a need for improved research and therapies.
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This study investigates susceptibility toward three fluoroquinolones (ciprofloxacin, levofloxacin, moxifloxacin), multiple fluoroquinolone-resistance mechanisms, and epidemiological relationship of neonatal septicaemic . Previous studies on fluoroquinolone resistance in focused primarily on ciprofloxacin susceptibility and assessed a particular mechanism of resistance; a more holistic approach was taken here. Epidemiological relationship was evaluated by Multi Locus Sequence Typing.

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Background: The (New Delhi Metallo-β-lactamase-1) gene has disseminated around the globe. NDM-1 producers are found to co-harbour resistance genes against many antimicrobials, including fluoroquinolones. The spread of large plasmids, carrying both and plasmid-mediated fluoroquinolone resistance (PMQR) markers, is one of the main reasons for the failure of these essential antimicrobials.

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