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Viruses

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Viruses


Viruses are smaller than bacteria, but are potentially more harmful. Once

viruses enter the body they cannot survive by themselves, therefore they 

invade cells and reproduce within the cell. Once they make thousands of 

copies the cell will burst releasing the copies of the virus into the blood

stream and around the body.

 

The most common illnesses causes by viruses are influenza (the common

flu), chicken pox and HIV.

 

Related Topics


Bacteria                                      Defending Against Infection