A sputum specimen is received in the microbiology laboratory. Gram staining and a microscopic examination reveal a paired, spherical, purple-stained organism. It can be reasonably assumed that this organism is which of the following?
a. Gram-negative ba-cilli c. Gram-positive dip-lococci
b. Gram-negative staphylococci d. Gram-positive ba-cilli
ANS: C
Diplococci are spherically shaped bacteria that occur in pairs; gram-positive organisms appear blue or violet. Gram-negative organisms have a red appearance from the counterstain. Staphylo-cocci are cocci that occur in irregular clusters. Bacilli are rodlike organisms.
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