1. why is it difficult to make antiviral drugs?

Designing safe and effective antiviral drugs is difficult, because viruses use the host's cells to replicate. This makes it difficult as the drug along with the virus will also interfere with the mechanism of host cells. Though, there are cenrtain drugs like interferon that kill virus.
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Viruses have few biochemical mechanisms of their own.They enter our cells and use our machinery for their life processes. This means that there are relatively few virus-specific targets to aim at. That's why making anti viral medicines is harder than anti bacterial medicines
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