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The first detection of methicillin-resistant <i>Staphylococcus aureus</i> ST398 in pigs in Korea
Lim, Suk-Kyung,Nam, Hyang-Mi,Jang, Gum-Chan,Lee, Hee-Soo,Jung, Suk-Chan,Kwak, Hyo-Sun Elsevier 2012 Veterinary microbiology Vol.155 No.1
<P><B>Abstract</B></P><P>In order to determine the presence of methicillin-resistant <I>Staphylococcus aureus</I> (MRSA) in pigs in Korea, a total of 657 nasal swabs were collected from pigs on 66 different pig farms nationwide during February 2008–May 2009. The prevalences of MRSA positive samples in pigs and farms were 3.2% (21/657) and 22.7% (15/66), respectively. Two different types were found among the 21 MRSA isolates: 17 strains of livestock-associated type (LA; ST398 or ST541/<I>spa</I> t034) and 4 strains of human-associated type (HA; ST72/<I>spa</I> t664 or t2461). The most prevalent type of MRSA strain was ST398/t034 (12/21, 57%), followed by ST541/t034 (5/21, 23.8%). The rest of the isolates were ST72/t664 (<I>n</I>=2) and ST72/t2461 (<I>n</I>=2), respectively. Our data provide evidence for the existence of not only LA types (ST398 and ST541) but also HA type (ST72) MRSA in pigs in Korea. This survey provides the first evidence of LA type MRSA in animals in Korea. In addition, the presence of human MRSA clones in pigs observed in this study suggests an additional reservoir for human MRSA infection, and vice versa.</P>
LIM, Suk-Kyung,MOON, Dong-Chan,CHAE, Myung Hwa,KIM, Hae Ji,NAM, Hyang-Mi,KIM, Su-Ran,JANG, Gum-Chan,LEE, Kichan,JUNG, Suk-Chan,LEE, Hee-Soo The Japanese Society of Veterinary Science 2016 The Journal of veterinary medical science Vol.78 No.12
<P>Resistance to antimicrobials was measured in 73 isolates of <I>Campylobacter jejuni</I> (<I>C. jejuni</I>) and 121 isolates of <I>Campylobacter coli</I> (<I>C. coli</I>) from chicken and swine feces and carcasses in Korea. Both bacterial species showed the highest resistance to (fluoro) quinolones (ciprofloxacin and nalidixic acid) out of the nine antimicrobials tested. Erythromycin resistance was much higher in <I>C. coli</I> (19.0%, 23/121) than in <I>C. jejuni</I> (6.8%, 5/73). The mutation in the 23S rRNA gene was primarily responsible for macrolide resistance in <I>Campylobacter</I> isolates. Several amino acid substitutions in the L4 and L22 ribosomal proteins may play a role in the mechanism of resistance, but the role requires further evaluation. A total of eight virulence genes were detected in 28 erythromycin-resistant <I>Campylobacter</I> isolates. All <I>C. jejuni</I> isolates carried more than four such genes, while <I>C. coli</I> isolates carried fewer than three such genes. The high rate of resistance highlights the need to employ more prudent use of critically important antimicrobials, such as fluoroquinolones and macrolides, in swine and poultry production, and to more carefully monitor antimicrobial resistance in <I>Campylobacter</I> isolates in food animals.</P>