Introduction to Lab Ex. Distribution of Microbes in the Environment. Introduction to Lab 8: Ex. Distribution of Microbes in the Environment This purpose of this exercise is to look for the presence of microorganisms in the environment.
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Distribution of Microbes in the Environment
This purpose of this exercise is to look for the presence of
microorganisms in the environment.
Using the culture media prepared in the previous lab we will look
for growth of bacterial and fungal organisms in three
The 3 environments that will be tested will be:
- the air
- personal environment
- a fomite (an inanimate object that can transmit
microorganisms from person to person)
Using aseptic technique these environments will be swabbed and
then streaked on the surface of the agar.
After allowing time for growth the plates will be examined for
These organisms move from one environment to another due to
transfer by natural or human/animal interactions and
Microorganisms are found in the air by transfer from soil, water,
animals, and humans (coughing/sneezing, etc)
Fomites carry microorganisms that are transferred to their surface
from the air, or from human contact.
Personal environments will carry microorganisms that are part of
the normal flora (organisms that are found on/in
animal/human tissues under normal conditions)
Moist areas of the body will host more organisms than dry
microbiota on and in
the human body:
Reservoirs of infection are continual sources of infection.
Transmission: ways by which infectious agents are spread from one
source/host to another host.
infected and susceptible host