A virus is not the same thing as bacteria. It’s much smaller and not technically an organism. Composed of only genetic material and protein, viruses need living hosts to survive. They can easily spread from person to person by touch or through microscopic water droplets in the air, such as from an uncovered sneeze or cough.
The most alarming aspect of viruses is that one minuscule virus in your body can multiply exponentially and make you very sick. Once it enters your system, it infiltrates your healthy cells. It will inject its genetic material to hijack your cells so that it can make copies to infect other cells. This is how viral diseases work, such as the flu.
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