if a virus enters my body will it enter and leave alone or will it enter and infect cells please i need help

Virus are a type of infectious agents it in almost all scenarios it will infect as many as cells it can before your WBC's can kill them

And in fact you are right now only in the state of Disease free. Every second your body is fighting off diseases. So to support your immune system eat Lots of Healthy food and stay safe!

Explanation:

It will infect cells in body on its departure.

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✿   this landform is a mountain

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.