what is agent,host and environment and what are some examples
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1. Describe the skin as an environment for microbial habitation giving examples.
2. What microorganisms would you expect to find along the gastrointestinal tract below the stomach? What interactions would you consider they might have with their human host?
Steps for Koch's postulate:
1. Association of the putative
causative agent with the
lesions of the disease
2. Isolation of the agent in pure
culture
3. Demonstration of the disease
upon introduction of the pure
culture of the agent into the
host
4. Re-isolation of the agent from
the infected or diseased host
Limitations:
Colonization with no
symptoms
⢠Non-culturable bacterias
⢠No disease models;
disease too serious to use
in human volunteers
Given the steps to Koch's postulate and the limitiations provided below it, how does antimicrobial drugs overcome these limitations?
Answer questions 5-10 by choosing an infectious disease that you are interested in and in 1-2 sentences each, briefly describe that disease with regard to the six steps in the chain of infection.
5) What is the infectious agent, what type of microorganism is it, and what disease(s) does it cause.
What is the reservoir of the infectious agent?
What is the most common portal of exit of the infectious agent?
What is the mode of transmission of the infectious agent?
What is the most common portal of entry of the infectious agent?
10) What is considered a susceptible host for the infectious agent?
