Definition and methods of disinfection Flashcards
1
Q
Importance of disinfection
A
- eliminate pathogens in the environment (obligate pathogens, notifiable diseases)
- lowering the infection pressure (after parturition, immunodeficiency)
- large number of saprophytic bacteria can overload the immune system –>lowering the production
2
Q
Mode of disinfection
A
- all in all out
- service period: emptying the building, cleaning, disinfection, rest phase
- poultry (14 days): cleaning 2d, disinfection 2d, rest phase 7d, rebuilding/ animals in 3d
3
Q
Physical, biological and chemical methods of sterilization and disinfection
A
- sterilization: elimination of every microorganisms
- disinfection: elimination of vegetative forms of pathogen microorganisms, lowering the number of saprophytic bacteria
4
Q
Spectrum
A
- Bactericide - destroys the vegetative forms of bacteria
- Bacteriostatic - inhibits bacterial growth
- Sporocide - destroys spore forms
- Fungicide - destroys the microscopic fungi
- Virucide - inactivates viruses
- Parasiticide - kill parasites
- Germicide - destroys every microorganism
5
Q
Mode of action
A
- due to their oxidative effects they damage the cells;
- coagulates the protein components of the cells;
- change the permeability of cell membranes
- inactivate cell enzymes of importance
- damage the DNA
6
Q
Biological and technological factors that influence the efficiency of disinfection
A
- Physical attributes: Consistence, Stability, Storage stability, Susceptibility to environmental factors, Concentration, Time
- germ resistance
- environment: temp, humidity, pH, material, surface, holes/ cracks/ ducts/ pores, biofilm
- effectiveness: presence of the organic and inorganic contamination
7
Q
What is biofilm?
A
- complex structure adhering to surfaces that are regularly in contact with water
- consisting of colonies of bacteria that secrete mucilaginous protective coating
