Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 26.6, Problem 1TQ
Summary Introduction
To review:
The reasons that make results inconclusive in the provided case.
Introduction:
Septicemia is a condition in which virus and bacteria are present in the blood and it is also known as blood poisoning. The presence of a virus in the blood is called viremia while the presence of bacteria is called bacteremia. Different types of pathogens can grow, replicate, and produce septicemia in optimal conditions. Septicemia can arise from an infection in any part of the human body.
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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
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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
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Chapter 26 Solutions
Microbiology: An Evolving Science (Fourth Edition)
Ch. 26.2 - Prob. 1TQCh. 26.2 - Prob. 2TQCh. 26.3 - Prob. 1TQCh. 26.5 - Prob. 1TQCh. 26.5 - Prob. 2TQCh. 26.5 - Prob. 3TQCh. 26.5 - Prob. 4TQCh. 26.6 - Prob. 1TQCh. 26.7 - Prob. 1TQCh. 26.7 - Prob. 2TQ
Ch. 26.7 - Prob. 3TQCh. 26.7 - Prob. 4TQCh. 26.7 - Prob. 5TQCh. 26 - Prob. 1RQCh. 26 - Prob. 2RQCh. 26 - Prob. 3RQCh. 26 - Prob. 4RQCh. 26 - Prob. 5RQCh. 26 - Prob. 6RQCh. 26 - Prob. 7RQCh. 26 - Prob. 8RQCh. 26 - Prob. 9RQCh. 26 - Prob. 10RQCh. 26 - Prob. 11RQCh. 26 - Prob. 12RQCh. 26 - Prob. 13RQCh. 26 - Prob. 14RQCh. 26 - Prob. 15RQCh. 26 - Prob. 16RQCh. 26 - Prob. 17RQCh. 26 - Prob. 18RQCh. 26 - Prob. 19RQCh. 26 - Prob. 20RQCh. 26 - Prob. 21RQCh. 26 - Prob. 22RQCh. 26 - Prob. 23RQCh. 26 - Prob. 24RQCh. 26 - Prob. 1TQCh. 26 - Prob. 2TQCh. 26 - Prob. 3TQCh. 26 - Prob. 4TQ
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