A virus is much smaller than a bacteria, typically consisting of genetic material wrapped in a protein coat. Bacterias are single-celled microorganisms that can survive without host cells. Viruses need to infect host cells in order to replicate themselves. Because they cannot reproduce on their own, viruses must infect living host cells in order to survive and produce more copies of the original virus. Antibiotics do not work against viral infections such as colds or the flu because antibiotics only target bacterial infections. The immune system works differently against viruses as opposed to bacterial invaders. Your body produces antibodies that recognize specific proteins found on the surface of viruses which helps your immune system fight off the virus.
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