As protection against the dozens of viruses that attack him throughout his lifetime, man has two major natural defenses: antibodies and a mysterious substance called interferon. Most antibodies give lifetime immunity, but the body takes days or weeks to make them, and each type of antibody is effective against only one type of virus. The body makes interferon faster, within a few hours of exposure, but still not fast enough to keep many invading viruses from multiplying in millions of cells and causing severe illness. It is effective against the whole catalogue...
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