Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 9 Lecture 2 Micro (Environmental Conditions (temp and ph, affect…
Chapter 9 Lecture 2 Micro
Selection of Microbial Control Methods
agents used for control of microbes should be
inexpensive
fast acting
stable during storage
capable of controlling microbial growth
Factors affecting the effectiveness of antimicrobial methods
sites being treated
degree of susceptability
environmental conditions
Site to be treated
choice of what agent depends on site
choose method and level of microbial control
What are the most resistant microbes
bacterial endospores
bacillus
clostridium
Cysts of protozoa
prevent entry from most disinfectants and protects against drying
cysts wall protects against drying
Prions
infectious protein
degenerative disease in the brain
most resistant microbe
Effect of Germicides
high
kill all pathogens
endospores
catheters
implants
heart/lung machines
medium
fungal spores
protozoan cysts
viruses
pathogenic bacteria
low
vegetative bacteria
fungi
protozoa
some viruses
Environmental Conditions
temp and ph
affect death rate
alter efficacy
warm disinfectants work better
Bio Safety Levels
BSL 1
handwashing
handling pathogens that don't cause disease
BSL 2
moderately hazardous agents
Hepatitis
MRSA
Influenza
extreme precautions with sharps
BSL 3
handling microbes in safety cabinets
HEPA filter
anthrax, yellow fever, TB
BSL 4
severe fatal disease
Ebola, smallpox, LASSA
space suits