Faculty of Veterinary Medicine University of Zagreb
Abstract
Over 57000 samples were tested in order to isolate Salmonella from animals and feedstuffs during the period 1998-2003. Four hundred and nine strains were isolated from poultry, 143 from pigs, 16 from cattle and 99 from feedstuffs. Ninety-two percent of isolated Salmonella from pigs depended to serovar S. choleraesuis. All Salmonella isolates from cattle depended to serovars S. dublin and S. enteritidis. A wider variety of Salmonella serovars was obtained from poultry and feedstuffs. The main source of Salmonella presence in feedstuffs was fish products. Sixty isolates of S. choleraesuis and 100 isolates of different serovars from poultry were tested for antimicrobial resistance. Only 1.3% of isolated Salmonella were resistant to ceftiofur, 5.6% to enrofloxacin. Thirty-four percent were resistant to nalidixic acid, 33% to tetracyclines and 8.1% were resistant to aminoglycosides (neomycin and gentamicin). Streptomycin was less effective: 30% of isolated Salmonella were resistant to this antibiotic. S. choleraesuis has more resistance than Salmonella serovars isolated from poultry. There is evidence that the prevalence of Salmonella has decreased in recent years. However, more attention must be paid to surveillance and monitoring of antimicrobial resistance.Više od 57000 uzoraka pretraženo je u svrhu izdvajanja bakterija roda Salmonella iz životinja i krmiva u razdoblju od 1998. do 2003. god. Iz peradi je izdvojeno 409 izolata, 143 iz svinja, 16 iz goveda i 99 iz krmiva. Devedeset i dva posto (92%) izdvojenih salmonela iz svinja pripadalo je serovaru Salmonella choleraesuis. Svi izolati iz goveda pripadali su serovarovima S. dublin i S. enteritidis. Širi raspon serovarova uočen je u peradi i krmivima. Glavni izvor salmonela prisutnih u krmivima bili su riblji proizvodi. Šezdeset izolata S. Choleraesuis i 100 izolata različitih serovarova iz peradi bilo je pretraženo na otpornost prema antimikrobnim tvarima. Samo je 1,3% izolata bilo otporno na ceftiofur, a 5,6% na enrofloksacin. Trideset i četiri posto bilo je otporno na nalidiksičnu kiselinu, 33% na tetracikline i 8,1% na aminoglikozide (neomicin i gentamicin). Streptomicin je bio manje djelotvoran te je 30% izdvojenih salmonela bilo otporno na ovaj antibiotik. S. choleraesuis je bila otpornija od serovarova izdvojenih iz peradi. Činjenica je da se proširenost salmonela smanjuje posljednjih godina te da više pozornosti treba posvetiti nadzoru nad mikrobnom rezistencijom
