A viral disease is sudden since the symptoms are not being shown until it will become to late to help the person having a disease. It is also extensive due to the lytic cycle. In this phase, the virus then would enter the cell then reproduce a copy,destroy a cell then releases several copies of itself in the entire body.
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Yes because the way we live can often be harmful such as for your spine it is often under alot of stress just from sitting down.
how often you get sick from disease can also be for example a pile of garbage right in your house I don't believe anyone likes that smell and its that way because of disease that often live on rotting food making us want to stay away from it
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