Molecular and Clinical Epidemiology of Salmonella Paratyphi A Isolated from Patients with Bacteremia in Nepal

Am J Trop Med Hyg. 2017 Dec;97(6):1706-1709. doi: 10.4269/ajtmh.17-0227. Epub 2017 Oct 5.

Abstract

Little is known about the epidemiology of typhoid and paratyphoid fever in Nepal. We aimed to elucidate the molecular and clinical epidemiology of Salmonella Paratyphi A in Nepal. Isolates were collected from 23 cases of bacteremia due to S. Paratyphi A between December 2014 and October 2015. Thirteen patients (57%) were male, and the median age was 21 years. None of the patients had an underlying chronic disease. All S. Paratyphi A isolates were sensitive to ampicillin, trimethoprim/sulfamethoxazole, ceftriaxone, and chloramphenicol. All isolates were resistant to nalidixic acid and were categorized as intermediately susceptible to levofloxacin. Phylogenetic analysis revealed close relatedness among the isolates, including several clonal groups, suggesting local spread. Patients with bacteremia due to S. Paratyphi A in Kathmandu, Nepal, were relatively young and nondebilitated. Improving control of S. Paratyphi infections should focus on effective infection control measures and selection of empirical therapy based on current resistance patterns.

MeSH terms

  • Ampicillin / therapeutic use
  • Anti-Bacterial Agents / therapeutic use
  • Bacteremia / drug therapy
  • Bacteremia / epidemiology*
  • Ceftriaxone / therapeutic use
  • Chloramphenicol
  • Drug Resistance, Multiple, Bacterial
  • Humans
  • Male
  • Microbial Sensitivity Tests
  • Molecular Epidemiology
  • Nalidixic Acid / therapeutic use
  • Nepal / epidemiology
  • Paratyphoid Fever / drug therapy
  • Paratyphoid Fever / epidemiology*
  • RNA, Bacterial / isolation & purification
  • Salmonella paratyphi A / drug effects*
  • Trimethoprim, Sulfamethoxazole Drug Combination / therapeutic use
  • Typhoid Fever / drug therapy
  • Typhoid Fever / epidemiology*
  • Young Adult

Substances

  • Anti-Bacterial Agents
  • RNA, Bacterial
  • Nalidixic Acid
  • Chloramphenicol
  • Ceftriaxone
  • Ampicillin
  • Trimethoprim, Sulfamethoxazole Drug Combination