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What is the purpose of disinfection?
to reduce numbers of pathogenic microogranisms and the spread of disease
chemical agents that kill or prevent the growth of microorganisms on living tissue
chemical agents that kill or prevent growth of microorganisms on non-living objects
do completely kill all microorganisms
thick walled, inactive, resistant form of certain bacteria
Define nosocomial infection
acquired in the hospital, likely to be resistant
List 5 characteristics of an ideal disinfectant.
- broad spectrum
- safe for living tissue and non-living objects
- convenient - easy to use
- stable - not inactivated by organic materal
Which is easier to kill - a virus with a lipid envelope, or a virus without a lipid envelope (naked virus)?
Does parvovirus have a lipid envelope? Is it easy to disinfect?
no - parvovirus is not affected by many disinfectants
What are the 2 main reasons it is imporatn to throroughly clean an object before applying a disinfectant?
- improve physical contact of the disinfectant to the object
- also, organic matter inactivates many disinfectants
What is organic matter? Give 3 examples of the sort of organic matter encountered in veterinary hospitals that may inactivate disinfectants.
- matter associated with life, is or has been part of a living animal, contains carbon
- feces, blood, pus, tissue debris, etc.
Why is it important to rinse off objects after disinfection?
to prevent disinfectant residues from coming into contact with the patient - especially imporatnt with objects like endotracheal tubes.
Why is it important to dry off objects after washing and rinsing, and before putting the objects into a disinfecting solution?
to prevent excess water from diluting out the disinfectant and making it less effective
If you mix up a batch of disinfectant and make it too dilute (concentration too low), what are the disadvantages?
- not effective
- waste of time
If you mix up a batch of disinfectant and you get the concentration too high, what are the disadvantages?
Do most disinfectants work better at warmer or at colder temperatures?
Does it matter if an object to be disinfected has a scrated, pitted, or rough surface? Why or why not?
yes - provides places of microorganisms to hide and avoid the disinfectant
Does contact time of the object with the disinfectant matter? How?
yes - most disinfectants require certain amount of contact time to kill microorganisms - the longer the better - follow manufacturer's directions
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