NURSING EXAM QUESTIONS
MICROBIOLOGY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Legionella pneumophilia
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Staphylococcus aureus
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Streptococcus pyogenes
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Escherichia coli
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Detailed explanation-1: -Legionella stains poorly with Gram stain, stains positive with silver, and is cultured on charcoal yeast extract with iron and cysteine.
Detailed explanation-2: -INFECTIOUS AGENT. Gram-negative bacteria of the genus Legionella. Most cases of Legionnaires’ disease are caused by Legionella pneumophila, but all species of Legionella can cause disease.
Detailed explanation-3: -Legionella are poorly visualized with Gram stain. Silver stains such as Warthin-Starry or Dieterle stains are preferred.
Detailed explanation-4: -The Legionella bacterium is a small, aerobic, waterborne, gram-negative, unencapsulated bacillus that is nonmotile and oxidase and catalase positive. Legionella bacterium is a fastidious organism and will not grow anaerobically on a standard media.