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Antibiotics that act chiefly on either Gram-positive bacteria or Gram-negative bacteria are called X. Antibiotics that work against only one specific organism or one particular disease are called Y. What are X and Y?

1. X = Broad spectrum antibiotics. Y = Narrow spectrum antibiotics.
2. X = Broad spectrum antibiotics. Y = Limited spectrum antibiotics.
3. X = Narrow spectrum antibiotics. Y = Limited spectrum antibiotics.
4. X = Narrow spectrum antibiotics. Y = Broad spectrum antibiotics.

Correct answer: X = Narrow spectrum antibiotics. Y = Limited spectrum antibiotics.

Solution

Antibiotics effective against a range of either Gram-positive or Gram-negative bacteria are NARROW spectrum (broad spectrum acts on both). Antibiotics effective against a single organism or disease are LIMITED spectrum. Hence X = narrow spectrum and Y = limited spectrum.

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