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Selection of suitable disinfections to prevent the spread of Corynebacterium pseudotuberculosis in farms focused on the production of milk products and meat
Liová, Alexandra ; Pořízka, Jaromír (oponent) ; Marková,, Jiřina (vedoucí práce)
This diploma thesis deals with the selection of suitable disinfectants and their effective concentrations for the prevention of the spread of the causative agent of caseous lymphadenitis in sheep and goat farms with a focus on milk processing, dairy and cheese production or meat production. For these purposes, disinfectants were selected from the group of quaternary ammonium compounds, oxidizing compounds, biguanides and alcohols, which were tested according to the ČSN EN 1656 standard on Corynebacterium pseudotuberculosis isolates forming a biofilm. The theoretical part first deals with the general characterization of the bacterial species Corynebacterium pseudotuberculosis and caseous lymphadenitis. In other chapters, the bacterial biofilm, its formation and the factors that influence it are described. Last but not least, the theoretical part is focused not only on the legislative treatment of the use or testing of disinfectants, but also on the closer characterization of their individual groups. In the experimental part, the procedure for determining the sensitivity of Corynebacterium pseudotuberculosis biofilms to selected disinfectants (benzalkonium chloride, chlorhexidine digluconate, ethanol, iodinated povidone, sodium hypochlorite and peracetic acid) was first optimized according to the ČSN EN 1656 standard. The optimization was followed by the cultivation and formation of biofilms of Corynebacterium pseudotuberculosis and the evaluation of their intensity by spectrophotometric determination of optical density. Subsequently, tested disinfectants were applied to the obtained biofilms, and after 24 hours of incubation from the end of the disinfection process, the effectiveness of the tested disinfectants was visually evaluated. At the end of the research, the minimum bactericidal concentrations for individual disinfectants were determined and the concentrations of these substances suitable for preventing and preventing the spread of the bacterium Corynebacterium pseudotuberculosis in small ruminant farms were also selected.
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