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Author Question: A sputum specimen is received in the microbiology laboratory. Gram staining and a microscopic ... (Read 30 times)

ARLKQ

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on: Jul 16, 2018
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

Question 2

Which of the following is spread by direct contact?
 
  a. Measles c. Staphylococcus
  b. Hepatitis B d. Histoplasmosis


manuelcastillo

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Reply #1 on: Jul 16, 2018
Answer to Question 1

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.

Answer to Question 2

ANS: C
Staphylococcus is spread by direct contact. Measles are spread by droplets; hepatitis B, by indi-rect contact; and histoplasmosis, by airborne dust.


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