Surveillance and Antimicrobial Resistance of Salmonella Strains Isolated from Slaughtered Pigs in Spain

Abstract

The prevalence of and the antibiotic resistance shown by Salmonella isolated from pigs in Andalusia (southern Spain) is reported. Salmonella enterica was recovered from 40 (33%) of 121 sampled herds, and a total of 65 isolates were serotyped. The most common Salmonella serotypes were Typhimurium and Rissen (30.7% each); others included Derby (9.2%), Brandenburg (9.2%), Newport (7.7%), Bredeney (4.6%), Anatum (3.0%), Hadar (1.5%), and Goldcoast (1.5%). One strain (1.5%) belonging to the monophasic variant of the Typhimurium serotype (Salmonella 4,5,12:i: -) was also detected. Definitive phage type (DT) 104b was the most common Typhimurium phage type isolated. These Salmonella strains were resistant to various antimicrobial agents, including tetracycline (84.6%), streptomycin (69.2%), neomycin (63.0%), sulfonamides (61.5%), ampicillin (53.8%), and amoxicillin (53.8%). All isolates were fully susceptible to ceftriaxone, ciprofloxacin, and colistin. Thirty-nine strains (64%) resistant to four or more antimicrobial agents were defined as multidrug resistant. Multidrug resistance profiles were observed in Salmonella serotypes Typhimurium, Rissen, Brandenburg, Bredeney, a monophasic variant, Gold-coast, Hadar, and Anatum, with serotypes Typhimurium and Brandenburg showing the most complicated resistance patterns (resistant to > or = 11 drugs).

Comparison of antimicrobial resistance patterns and phage types of Salmonella Typhimurium isolated from pigs, pork and humans in Belgium between 2001 and 2006

“…Despite that for most of the Salmonella infections antimicrobial treatment is not required, it can be life saving for invasive infections. Fluoroquinolones and extended spectrum cephalosporins are the preferred drugs-of-use for the treatment of invasive Salmonella infections in adults and children, respectively (Angulo, Johnson, Tauxe, & Cohen, 2000;Astorga Marquez et al, 2007;Helms et al, 2002). The resistance data on S. Typhimurium demonstrate that a low level of resistance (≤1.2%) to these critical antimicrobials is already observed in the S. Typhimurium population in Belgium during the studied period.…”

“…However infection with Salmonella through direct contact with carrier animals on farms and in slaughterhouses can also occur (Fey et al, 2000;Hendriksen, Orsel, Wagenaar, Miko, & van Duijkeren, 2004). Worldwide, one of the most commonly isolated non-typhoid Salmonella serovars in pigs, pork and humans is Salmonella Typhimurium (Astorga Marquez et al, 2007;Boyen et al, 2008;Perugini et al, 2010).…”

Detection of <i>Salmonella enterica</i> Serovar Rissen in Slaughter Pigs in Northern Ireland

“…Of the S. Rissen isolated from pigs in Europe, tetracycline is the most common resistance phenotype [7] [19] [25]. Garcia-Feliz [26] investigating the antibiotic resistance of a panel of 114 S. Rissen isolates, all originating from pigs, recorded that over 50% of isolates were resistant to tetracycline alone.…”

“…Rissen is a commonly reported serotype around the world and it is amongst the top three serotypes found in pigs and pork products in Europe and Southeast Asia [3]. Numerous studies have identified S. Rissen in slaughtered pigs in Portugal [4] and within pig fattening units and from slaughter-age pigs and Spain [5] [6] [7] [8] [9]. There have been further reports of S. Rissen in pig abattoir studies in Italy [10], Belgium [11], the Netherlands [12], Portugal [13] as well as in breeding herds in the UK [14] and in finishing pigs in Northern Ireland [15], thus demonstrating its' increase in European pig herds.…”

Prevalence and resistance of bacterial strains isolated from chicken beddings in rural households

“…Another aspect of our findings is the resistance to antibiotics not used in veterinary medicine of food animals in Greece such as vancomycin, oxolinic acid, cefotaxime and others. Possibly this finding can be attributed to cross resistance with other antibiotics with similar chemical structure or with similar mode of action [18][19]. The DOI: 10.9790/2380-1001012328 www.iosrjournals.org 26 | Page area where the study was conducted is not densely populated and with few anthropogenic activities.…”