Final answer:
Antibiotics do not work on viral infections like the common cold or flu due to differences in how viruses and bacteria operate.
Explanation:
Antibiotics are not effective against viral infections such as the common cold or flu because they target bacteria, not viruses. Viruses are not affected by antibiotics because they operate differently, lacking the structures that antibiotics target in bacteria. Misusing antibiotics for viral infections can lead to antibiotic resistance, making them less effective when truly needed for bacterial infections.
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