Serotype epidemiology and multidrug resistance patterns of Salmonellaenterica infecting humans in Italy. Issue 1 (December 2016)

• Record Type: Journal Article
• Authors: Frasson, Ilaria; Bettanello, Sabrina; Canale, Ettore; Richter, Sara; Palù, Giorgio
• Is Part Of: Gut pathogens. Volume 8:Issue 1(2016)
• Page Start: 1
• Page End: 7
• Publication Date: 2016-12
• Subjects: Salmonella -- Multidrug resistance -- Humans -- Epidemiology; Gastrointestinal system -- Microbiology -- Periodicals; 616.3
• DOI: 10.1186/s13099-016-0110-8
• Languages: English
• ISSNs: 1757-4749

Abstract

Abstract Background Salmonella enterica is the zoonotic agent most frequently responsible for foodborne infections in humans worldwide. In this work the presence ofS. enterica was investigated in 734 unique enteropathogenic isolates collected from human patients between 2011 and 2012. Results AllSalmonella spp. isolates were subjected to serotyping and antimicrobial susceptibility testing. Isolates displaying phenotypes and antimicrobial susceptibility profiles different from the reference strains were genotipically characterized. Several plasmid-embedded resistance determinants were identified and characterized. Non-typhoidal serotypes were most frequently diagnosed;monophasic Salmonella typhimurium 1, 4 [5], 12:i - andS. typhimurium represented the most prevalent serovars. Five isolates displayed phenotypes with extremely reduced susceptibility to antimicrobials: we detected multidrug resistance elements belonging to Ambler class A and class C in two non-typhoidalS. enterica serovars, i.e.Rissen andmonophasic S. typhimurium 1, 4 [5], 12:i -, and in one typhoidal serovar, i.e., Paratyphi B . These resistance determinants have been so far almost exclusively associated with non-Salmonella members of theEnterobacteriaceae family. Alarmingly, two colistin resistantSalmonella enteritidis were also found. Conclusions This work draws the attention to the still low, but rising, percentage of multidrug resistantSalmonella isolates infecting humans in Italy. Our results suggest that prompt monitoring ofSalmonella serovar dissemination and resistance to antimicrobials is highly required.