MRSA (methicillin-resistant Staphylococcus aureus) bacteria growing on an agar plate Paper tab infused with vancomycin. The surrounding area it has diffused into, killing off all bacteria in the area, is called the zone of inhibition. Rectangular S VRSA (vancomycin-resistant Staphylococcus aureus) bacteria growing on an agar plate Paper tab infused with vancomycin. Note that the zone of inhibition is much smaller, demonstrating that the bacteria can grow in the presence of the antibiotic.

Microbiology for Surgical Technologists (MindTap Course List)
2nd Edition
ISBN:9781111306663
Author:Margaret Rodriguez, Paul Price
Publisher:Margaret Rodriguez, Paul Price
Chapter12: Gram-positive Cocci
Section: Chapter Questions
Problem 4UTM
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Q1: What is the difference between MRSA and VRSA? Q2: Why is there a clear zone (the “zone of inhibition”) around the paper disk in the top dish but not in the bottom dish? Q3: Why is the lack of a clear zone around the paper disk in the bottom dish so alarming?

MRSA (methicillin-resistant Staphylococcus
aureus) bacteria growing on an agar plate
Paper tab infused with vancomycin. The
surrounding area it has diffused into, killing
off all bacteria in the area, is called the
zone of inhibition.
Rectangular S
VRSA (vancomycin-resistant Staphylococcus
aureus) bacteria growing on an agar plate
Paper tab infused with vancomycin. Note
that the zone of inhibition is much smaller,
demonstrating that the bacteria can grow in
the presence of the antibiotic.
Transcribed Image Text:MRSA (methicillin-resistant Staphylococcus aureus) bacteria growing on an agar plate Paper tab infused with vancomycin. The surrounding area it has diffused into, killing off all bacteria in the area, is called the zone of inhibition. Rectangular S VRSA (vancomycin-resistant Staphylococcus aureus) bacteria growing on an agar plate Paper tab infused with vancomycin. Note that the zone of inhibition is much smaller, demonstrating that the bacteria can grow in the presence of the antibiotic.
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