What is antibiotic resistance and why is it a problem?

• A. Bacteria acquire mutations or genes that confer resistance; resistant strains spread, making infections harder to treat
• B. Antibiotics always work
• C. Humans develop resistance to antibiotics
• D. Viruses become resistant to antibiotics

Answer: (A)

Antibiotic resistance happens when bacteria change in ways that let them survive exposure to antibiotics. These changes can come from random mutations in the bacteria’s DNA or from transferring resistance genes from other bacteria through mechanisms like plasmids. When antibiotics are used, susceptible bacteria are killed or slowed, while those with resistance survive and multiply. This selective pressure over time leads to populations of resistant bacteria that can spread in communities or healthcare settings, making infections harder to treat and control.

Because these resistant strains don’t respond to standard drugs, infections may require alternative or higher-dose treatments, longer courses, or more aggressive care, and they can lead to more serious illness or death. This is why antibiotic resistance is a major public health problem: it reduces our ability to treat common infections and increases the burden on patients and healthcare systems.

The other statements don’t fit because antibiotics target bacteria, not viruses, so they don’t always work against bacteria that have or acquire resistance. Humans don’t become resistant to antibiotics in the same bacterial sense; it’s the bacteria that evolve resistance, not the human body.