Disinfectants 1

  1. What is the purpose of disinfection?
    to reduce numbers of pathogenic microogranisms and the spread of disease
  2. Define antispetics
    chemical agents that kill or prevent the growth of microorganisms on living tissue
  3. Define disinfectants
    chemical agents that kill or prevent growth of microorganisms on non-living objects
  4. Define sterilizers
    do completely kill all microorganisms
  5. Define spore
    thick walled, inactive, resistant form of certain bacteria
  6. Define nosocomial infection
    acquired in the hospital, likely to be resistant
  7. 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
    • inexpensive
  8. Which is easier to kill - a virus with a lipid envelope, or a virus without a lipid envelope (naked virus)?
    enveloped virus
  9. Does parvovirus have a lipid envelope? Is it easy to disinfect?
    no - parvovirus is not affected by many disinfectants
  10. 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
  11. 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.
  12. 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.
  13. 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
  14. 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
    • effort
    • money
  15. If you mix up a batch of disinfectant and you get the concentration too high, what are the disadvantages?
    • toxic
    • corrosive
    • expensive
  16. Do most disinfectants work better at warmer or at colder temperatures?
  17. 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
  18. 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
Card Set
Disinfectants 1