A viral infection is simply caused by a virus. Antibiotics are used to treat infections caused by bacteria. Hence, antibiotics are not capable of killing viruses. Viruses, on the other hand, are structured differently compared to bacteria and survive and replicate in different ways too. A virus is surrounded by a protective protein coat and not a cell wall that can essentially, be attacked by an antibiotic. Furthermore, in contrast to bacteria, viruses move into our body's cells, rather than attack them from the outside. As a result of all these differences, antibiotics may not be used to treat viral infections.
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