Viruses, which are a thousand times smaller than bacteria, do not contain the enzymes needed “to carry out the chemicals reactions for life.” In this way, viruses need a host cell in order to reproduce. Depending on the virus, it will attack certain parts of the human body, such as the respiratory and digestive systems for flu viruses. Another example is of HIV, which attacks the T-cells of the immune system. After attaching to a host cell and dissolving through its outer membrane, viruses release genetic instructions into an infected cell’s enzymes, which then reproduce more viruses that break free and infect surrounding cells.
A body catching a virus is a lot simpler than most would think, especially the flu virus. The flu virus is one that attacks most individuals at least once in their lifetime. This is simply because it is so easy to spread.
The flu virus spreads by latching on to one of your cells and convincing your body that it should produce more of it. You may think that it would take a longer process for these new “bad” viruses to be created but it really only takes a few fractions of a second.
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