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How does a virus infect the human body?

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Viruses can affect only certain cells in your body, like those of your upper respiratory system, causing common cold symptoms. They can affect your whole body, such as with an influenza virus, leaving you with all over muscle soreness and fever. Sometimes a virus can attack your nervous system causing serious illness. read more

The human body does have some natural defenses against a virus. A cell can initiate RNA interference when it detects viral infection, which works by decreasing the influence of the virus's genetic material in relation to the cell's usual material. read more

Viruses need a way to enter the body before they can infect a host cell. For instance, WebMD explains that the Ebola virus spreads through contact with the blood or bodily fluids of an infected animal or person. Once this contact occurs, the virus may find a way to penetrate into host cells and spread the infection. read more

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