A Gram stain leaves the following organism violet. Which pathogen could this be?
a. Escherichia coli c. Staphylococcus au-reus
b. Bacillus anthracis d. Streptococcus pneumoniae
ANS: D
Streptococcus pneumoniae are gram-negative spheres that occur in chains. Escherichia coli are gram-negative and rod-shaped. Bacillus anthracis are gram-positive and rod-shaped. Staphylo-cocus aureus are gram-positive spheres that occur in irregular clusters.
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