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They both carry some sort of genetic material.

A virus is a package of genetic material. This genetic material is either deoxyribonucleic acid (DNA) or

ribonucleic acid (RNA). This little package is carried in a shell called the capsid.

Some viruses have an extra envelope covering the capsid. While covered in its capsid, a virus is in an extracellular state.

This means the virus hasn't invaded a host cell and is pretty much just hanging around doing nothing.

However, once a virus invades a host cell, it becomes intracellular, and that's when the action starts.

A virus can infect a cell several different ways - through bodily fluids (such as saliva or blood),

air (sneezing or coughing) or a mosquito bite. The virus then begins its attack by triggering the cell

to let it in and take control. The virus starts replicating and overriding the cell's normal functioning and, in some cases, inserts its own genetic material into the cell's DNA. The cell actually does all the work the virus just calls the shots.

The virus becomes a commander and starts sending out more infectious troops into the body.

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