What is selective toxicity?

What is selective toxicity?

• A. They destroy host cells preferentially
• B. They inactivate toxins
• C. They fail to distinguish microbes from host cells
• D. They kill microbial cells but not the host's cells

Answer: (D)

Selective toxicity is the ability of an antimicrobial to target features unique to microbes, or sufficiently different from human cells, so the drug harms the microorganism while sparing the patient’s cells. This is achieved by exploiting differences such as bacterial cell wall synthesis, bacterial ribosomes, or specific bacterial metabolic pathways that humans don’t rely on. The option that best captures this idea says the drug kills microbial cells without harming the host’s cells, which is the core aim of selective toxicity: effective microbial killing with minimal host injury. The other ideas describe scenarios that would involve harming the host or focusing on toxin neutralization rather than killing the microbes, which does not illustrate selective toxicity.

Selective toxicity is the ability of an antimicrobial to target features unique to microbes, or sufficiently different from human cells, so the drug harms the microorganism while sparing the patient’s cells. This is achieved by exploiting differences such as bacterial cell wall synthesis, bacterial ribosomes, or specific bacterial metabolic pathways that humans don’t rely on. The option that best captures this idea says the drug kills microbial cells without harming the host’s cells, which is the core aim of selective toxicity: effective microbial killing with minimal host injury. The other ideas describe scenarios that would involve harming the host or focusing on toxin neutralization rather than killing the microbes, which does not illustrate selective toxicity.