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natural antivirals against human viruses :: Article Creator Your Immune System Makes Its Own Antiviral Drug − And It's Likely One Of The Most Ancient Antiviral drugs are generally considered to be a 20th century invention. But recent research has uncovered an unexpected facet to your immune system: It can synthesize its own antiviral molecules in response to viral infections. My laboratory studies a protein that makes these natural antiviral molecules. Far from a modern human invention, nature evolved cells to make their own "drugs" as the earliest defense against viruses. How antivirals work Viruses have no independent life cycle – they are completely dependent on the cells they infect to supply all the chemical building blocks needed to replicate themselves. Once inside a cell, the virus hijacks its machinery and turns it into a factory to make hundreds of new viruses. Antiviral drugs are molecules that inactivate proteins essential to...