Serotypes, antibiotic resistance and class 1 integrons in Salmonella isolates from pediatric cases of enteritis in Tehran, Iran

Giovanni Giammanco, Caterina Mammina, Shohreh Farshad, Parviz Owlia, Reza Ranjbar, Aurora Aleo

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46 Citazioni (Scopus)


The present study was conducted to investigate serotype distribution, antimicrobial resistance patterns, carriage of class 1 integron, and clonality of Salmonella strains isolated from patients aged 0-12 years in Tehran, Iran, during 2007-2008. A total of 139 Salmonella isolates were studied. Salmonella serotypes Enteritidis, Infantis, and Typhimurium included 84.9% of isolates, Enteritidis accounting for 41.7%. The most prevalent resistances were to doxycycline (64.7%), nalidixic acid (61.2%), tetracycline (51.8%), and streptomycin (42.8%). Fifty-three (38.1%) isolates contained class 1 integron. Eight different gene cassettes were identified, aadA1 being the most frequently encountered. Pulsed-field gel electrophoresis showed that integron-positive Salmonella strains belonging to serotypes Infantis, Enteritidis, and Typhimurium were attributed to two, three, and five different pulsotypes, respectively. The findings indicated that the distribution and drug resistance pattern of most prevalent Salmonella serotypes were broadly similar to that reported globally from human isolates. Presence of class 1 integrons was common among Salmonella serotypes in Tehran, Iran. Concurrent clonal expansion and horizontal transmission events seem to contribute to increase in drug resistance prevalence among Salmonella serotypes.
Lingua originaleEnglish
pagine (da-a)547-553
Numero di pagine7
RivistaFoodborne Pathogens and Disease
Stato di pubblicazionePublished - 2011


All Science Journal Classification (ASJC) codes

  • Food Science
  • Microbiology
  • Applied Microbiology and Biotechnology
  • Animal Science and Zoology

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