MacConkey agar is useful in veterinary bacteriology because it primarily selects for:
Correct answer: D. Gram-negative enteric bacteria
- A. Acid-fast mycobacteria
- B. Strictly anaerobic bacteria
- C. Dermatophyte fungi
- D. Gram-negative enteric bacteria
Explanation
MacConkey agar contains substances that inhibit many Gram-positive organisms, allowing Gram-negative enteric bacteria to grow. It also differentiates lactose fermenters from non-fermenters, but its principal selective function is for Gram-negative bacteria.
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Covers the structure, classification, growth and transmission of bacteria, viruses, fungi and other disease causing microorganisms in animals. It explains innate and acquired immunity, antibodies, antigens, vaccination, hypersensitivity and diagnostic methods, while distinguishing infectious agents from the immune responses they produce.
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