From a contaminated intravenous catheter you isolate Gram-positive cocci, beta-hemolytic, and catalase positive. MSA results below (grown aerobically): Which pathogen from the list below have you isolated? O Streptococcus pyogenes_ O Staphylococcus aureus_ Staphylococcus epidermidis Streptococcus pneumoniae_
From a contaminated intravenous catheter you isolate Gram-positive cocci, beta-hemolytic, and catalase positive. MSA results below (grown aerobically): Which pathogen from the list below have you isolated? O Streptococcus pyogenes_ O Staphylococcus aureus_ Staphylococcus epidermidis Streptococcus pneumoniae_
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:**Laboratory Analysis: Identifying Microbial Pathogens**
In a laboratory experiment, you are working with a contaminated intravenous catheter. From this, you isolate organisms that are Gram-positive cocci, beta-hemolytic, and catalase positive.
**Results from Mannitol Salt Agar (MSA):**
An image shows an MSA plate with red coloration, indicating that the bacteria did not ferment mannitol.
**Question:**
Based on the characteristics and MSA results, identify which pathogen from the following list has been isolated:
1. *Streptococcus pyogenes*
2. *Staphylococcus aureus*
3. *Staphylococcus epidermidis*
4. *Streptococcus pneumoniae*
**Analysis of MSA Plate:**
- MSA is selective for staphylococci due to its high salt concentration.
- A positive mannitol fermentation would turn the medium yellow.
- The red coloration on the plate suggests a non-mannitol fermenting organism.
Use this information to determine the correct pathogen.
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