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antiviral medicines are difficult to be made because the virus has the capability to modify it self as the time passes new breeds of virus are developed sometimes virus develop resistance towards medicines it means that a medicine which made a particular virus ineffective once upon a time, it may not show any effect on the same virus after some times.
Viruses are so much smaller and so simple that it is hard to come up with ways to defeat them. With a capsid and sometimes an envelope around the capsid and either RNA or DNA core, there just are only a few ways to get at them. They usually hijack all the other things that they need from the cell that they are in. If you use some antiviral against those hijacked cell enzymes or parts, you will kill all the uninfected cells.
It is like having a tomato in a sealed off glass container which you can't get at but somehow it sneaks out and kills your cells and makes more of those darn tomatoes.
A few antivirals have been made. One is the familiar Tamiflu. It blocks an enzyme that the flu virus must use to escape your infected cells. Too bad that many others don't need the enzyme.
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