Microbiology Fundamentals: A Clinical Approach
Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781260163698
Author: Cowan
Publisher: MCG
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Chapter 11, Problem 20Q
Summary Introduction

To explain:

Possible reasons for the non-occurrence of the diseases in an animal model when the aerosol form of the bacterium is administered.

Concept introduction:

In this particular case, Koch’s postulates are being performed on sputum specimen which is taken from patients with the unexplained respiratory illness. An abundance of a specific kind of colony is observed on agar cultures. However, if the bacteria are administered in the aerosol form in a model organism, it does not cause disease.

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You are working in a lab studying Streptococcus pyogenes as a cause of necrotizing fasciitiis.  You have an overnight culture that you want to know the starting concentration of, so do a set of six 1:10 serial dilutions (putting 1 mL from the stock into a 9 mL blank), with tube #1 being 1:10, #2 is 1:100, etc.    You plate 0.1 mL from tube 5 onto a blood agar plate and the next morning count 134 colonies.  How many bacteria (measured in CFU/mL) were in the overnight culture flask? A. 1.34 x 10^4 CFU/mL B. 1.34 x 10^5 CFU/mL C. 1.34 x 10^6 CFU/mL D. 1.34 x 10^7 CFU/mL E. 1.34 x 10^8 CFU/mL F. cannot tell based on the data given - you'd need to know the volume of the original culture flask
Note that it is not appropriate to self-diagnose outside of a medical context and this is a completely hypothetical scenario. Imagine you have a rash on your foot. You're concerned that it's an infection and inoculate a sample onto an agar plate. You wonder, How can I figure out whether the pathogen is a bacterium vs a eukaryote? You decide to use lab supplies to get a basic understanding of the pathogen. Be specific about what tests you use and what you expect the results to be. Limit yourself to experiments we could do in our lab. What is one experiment you could do, involving culturing the organism?
Note that it is not appropriate to self-diagnose outside of a medical context and this is a completely hypothetical scenario. Imagine you have a rash on your foot. You're concerned that it's an infection and inoculate a sample onto an agar plate. You wonder, How can I figure out whether the pathogen is a bacterium vs a eukaryote? You decide to use lab supplies to get a basic understanding of the pathogen. Be specific about what tests you use and what you expect the results to be. Limit yourself to experiments we could do in our lab. What is a procedure you could do, involving making a slide of the organism?

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Microbiology Fundamentals: A Clinical Approach

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