Microbiology: A Systems Approach
Microbiology: A Systems Approach
5th Edition
ISBN: 9781259706615
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 17, Problem 3MCQ
Summary Introduction

Introduction:

The term Streptococcus was coined by Albert Theodor Billroth. It is a genus of Gram-positive spherical bacteria that belong to the phylum Firmicutes and order Lactobacillales.

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When determining the clinical significance of cultures, a. the number of microbes is signifi cant. b. the presence of a single colony of a true pathogen may indicate the presence of the disease if the culture comes from a site known to be sterile (i.e., cerebrospinal fl uid). c. the repeated isolation of a relatively pure culture of any microorganism can mean it is an agent of disease, although this is not always the case. d. a range of tests may be needed to identify a pathogen. e. all of the above are true.
An elderly man with influenza acquires a case of pneumonia. Gram-positive cocci isolated from his sputum give beta-hemolysis on blood agar. The infection is very difficult to treat. Later, it is shown that the man shared the room with a patient with bone infection. Isolates from both infections were the same. a. Describe 2 biochemical tests that can be used for the definitive diagnosis. b. Describe 2 virulence factors of this pathogen and implicate them in diseases.
For each of the following aspects, compare and contrast the EnteroPluri-Test System to the API® 20E System for Enterobacteriaceae identification. a. time requirement b. specimen preparation c. tests utilized d. anaerobic conditions e. interpretation of results
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