Using disinfectants in poultry houses is a common practice to ban the zoonotic pathogens like Salmonella. A major concern in using disinfectants is the emergence of bacteria strains that resist some disinfectants. This phenomenon is manifested in the resistance of some Salmonella serotypes against quaternary ammonium compounds. Such resistance is attributed to qacED1 gene which may be possessed by some Salmonella serotypes. This work aimed to evaluate the resistance of Salmonella serotypes (S. Typhimurium, S. Infantis and S. Entiridis) against different disinfectants (benzalkonium chloride, iodine, gluteraldehyde and hydrogen peroxide). The effect of the disinfectants were evaluated by treatment of the bacteria with different concentrations (1:100, 200 and 400) at different temperatures and periods. Bacterial count was performed before and after the treatment. PCR for presence of qacED1 gene was also performed before and after the treatment. The biocidal effect of the disinfectants found to be dependent on concentration, temperature and treatment period in addition to the type of the disinfectant. Hydrogen peroxide proved to be the most active agent followed by gluteradehyde, iodine and benzalkonium chloride. A link between the resistance against benzalkonium chloride and the existence of qacED1 gene was proven in S. Typhimurium, whether treated or not treated with benzalkonium chloride.
There are new emerging cattle mastitis agents that have become a major burden economically on the dairy industry because of their negatively affects on production and quality in dairy cattle farming in Turkey,. To overcome this emerged problem, antimicrobials are adopted in this sector to prevent and administrate mastitis and other bacterial infections affecting cattle in the country. Nevertheless, the occurrence of antimicrobial resistance (AMR) is increasing in both animal and human contaminants. The occurrence and features of AMR of the emerging cattle mastitis agents in dairy cattle in Turkey, have been manifested. As a result, the goal of this research was to assess secluded emerging cattle mastitis agents in Turkey and to appraise the antimicrobial susceptibility of these pathogens. Sixty one milk samples from cattle wwith mastitis were collected between 2014 and 2018 for assessment of clinical mastitis in diagnostic and analysis laboratory of Faculty of Veterinary Medicine, Afyon Kocatepe University. Twenty five microorganism species arised as cattle mastitis agents were assessed in these milk samples. The outcomes of the present study identified the necessity for advancements in antimicrobial stewardship as well as infection administration plans in Turkish farms to decrease the occurence of AMR. VITEK Compact® 2 systemmethod showed that Streptococcus uberis had the maximum AMR while Globicatella sulfidifaciens had the minimum AMR. The study depicts that the number of cattle mastitis is directly proportional to the size of the herd.
During the past several years, microbial resistance to common antibiotics has continually increased, and this growing resistance threatens the effective treatment of bacterial infections. Thus, there is increased research on novel drugs like seaweeds. In this study, crude extracts of three seaweeds (Ulva clathrate, Ulva lactuca and Ulva compressa) were obtained with a Soxhlet extraction apparatus. Evaluation of antimicrobial efficiency was carried out using well diffusion method and microdilution method (MIC) at different concentrations (100-0.195mg/ml) for Staphylococcus aureus and Escherichia coli. The green seaweed extracts produced inhibition zones ranging from 7 to 12.5 mm. Methanol extracts produced the strongest inhibitory activity against the tested bacterial species. Overall, this study provides data on the potential use of algal extracts for the development of antimicrobial agents to treat infectious diseases.
The current work aimed to find substitutes for antibiotics because of the side effects of antibacterial agents and the expansion of bacterial resistance to these agents. The scope of this study was to evaluate the antibacterial activity of gold and silver nanoparticles (AuNPs and AgNPs) against selected animal pathogens (Staphylococcus aureus, Klebsiella pneumonia, Streptococcus pneumoniae, Escherichia coli, Bacillus abortus and Mycobacterium bovis). The synthesized nanoparticles were distinguished by scanning electron microscopy (SEM) analysis and tested for antibacterial activity with the broth microdilution method, well diffusion assay, and minimum bactericidal concentration procedure. Results showed that both AuNPs and AgNPs displayed good antibacterial activity against all tested bacteria. The strongest antibacterial action of AgNPS (18 mm) was contra E. coli. AuNPs displayed good antibacterial activity against S. aureus and B. bovis with a suppression area of 14 mm. Therefore, it is suggested that AgNPs and AuNPs could be effectively used against animal pathogens and may contribute to reducing antibiotic resistance. However, there is a need for further research on the in vivo toxicity and mechanisms of action of AuNPs and AgNPs.
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