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    Distribution of serotypes and antibiotic resistance of avian pathogenic Escherichia coli strains isolated from chickens
    (Kafkas Üniversitesi Veteriner Fakültesi, 2022) Sever, Nurdan Karacan; Yapıcıer, Özlem Şahan; Akan, Mehmet
    Avian pathogenic Escherichia coli (APEC) causes systemic or localized infections with different clinical courses such as septicemia, air sac disease, polyserositis and coligranuloma. Colibacillosis causes significant economic losses in the poultry industry due to the need for the control of the disease by causing carcass contamination, decreased feed conversion rate, mortality in poultry. In this study, 99 E. coli strains were isolated from different production units in the same integration. Antimicrobial susceptibility tests of all strains were performed and thirty strains with multidrug resistance (MDR) in the different production units were serotyped. The highest resistance was observed against oxytetracycline, erythromycin amoxicillin and doxycycline. Multidrug resistance was observed at a rate of 81.81% (81/99). Among the 30 strains that could be serotyped, O78 and O125 were determined as the most prevalent serogroups with 43.3% (13/30) and 16.6% (5/30) rates, respectively, while O1, O8, O18, O142, O143, O157, O158, O164 and O169 were found as rare serogroups. O78 was determined as a high antibiotic resistant strain in isolated E. coli strains and a dominant serotype in the selected strains and this study demonstrated that a correlation can be between breeders and their progeny.
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    In vitro antibiotic resistance of Staphylococci isolated from different animal species
    (TUBITAK, 2020) Karacan Sever, Nurdan; Akan, Mehmet
    The purpose of this study is to investigate resistance to antibiotics of Staphylococcus species isolated from various samples belonging to different animal species. Among 48 Staphylococcus spp. strains, Staphylococcus intermedius was the most common species, followed by S. aureus, S. epidermidis, S. hyicus, S. saprophyticus. In a total of 48 Staphylococcus strains, the highest antibiotic resistance was observed to oxacillin (79.17%), tetracycline (39.58%), and ampicillin and cefoxitin (31.25%). Of 48 Staphylococcus strains, 42 showed resistance to at least one antimicrobial agent, while 23 of the strains had multidrug resistance. Antimicrobial resistance to tetracycline and ampicillin, erythromycin, streptomycin was detected frequently in S. aureus,S. intermedius, and S. epidermidis, respectively. Resistance rates for ampicillin, cefoxitin, and enrofloxacin were determined as 66.67% in S. hyicus strains. S. saprophyticus was determined to show resistance to 13 antibiotics other than meropenem. The highest antibiotic resistance was determined in S. aureus, S. intermedius, S. epidermidis, and in 48 Staphylococcus strains to oxacillin. Consequently, this study revealed resistance to various antibiotics in Staphylococcus species. Additionally, the presence of high oxacillin resistance and multidrug resistance in the Staphylococcus strains revealed the importance of determination of antimicrobial susceptibility before treatment and for rational use of antibiotics