Case Study 1

A 64-year old male with fever, malaise, and cough.

Gram-negative is correct!

Question 1 of 6
What do you know about the organism from examination of the Gram stain?
A. Gram-positive
Bacteria with a thick murein cell wall retain crystal violet even when washed with acidified ethanol. Bacteria with this type of cell wall are called Gram-positive and appear purple.
B. Gram-negative
Gram-negative bacteria can be stained with safranin, making them look pink.

The Biology Project
University of Arizona
Tuesday, August 4, 1998
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