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Chapter 9 Lecture 2 (Relative susceptibility of microorganisms (Death…
Chapter 9 Lecture 2
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Species of mycobacteria
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Medical people must use a strong disinfectant or heat to treat whatever comes into contact with a TB patient including utensils, equipment and the room a pt. is in.
Cysts of protozoa
Their cysts wall prevents entry of most disinfects.
The cyst’s wall protects against drying and will shield against radiation and heat.
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Germicide
The effectiveness of germicides can be classified as high, intermediate and low depending on their ability in inactivating or destroying them on a medical instrument that cannot be sterilized
Germicide classification
High-level germicides
Kill all pathogens, including endospores
Catheters, implants, & parts of heart lung machines
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Low-level germicides
Kill vegetative bacteria, fungi, protozoa, and some viruses
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Environmental conditions
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Organic materials (fat, feces, vomit, blood, biofilms)
Interfere with the penetration of heat, chemicals, and some forms of radiation
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Prions
Are infectious proteins that cause degenerative disease of the brain, are more resistant than any cell or virus.
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Biosafety levels
The CDC has established guidelines for four levels of safety in microbiology labs dealing with pathogens:
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