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bcoz some viruses are able to survive even in extreme hard conditions like high temperature. For those medicines r used which breaks the bases of their DNA. REMEMBER..... viruses r prokaryotic and they r from the very beginning of life on earth. they infect the hosts and more viruses r created and .......u know what

For more visit.. http://en.wikipedia.org/wiki/Virus#Bibliography. they also have a protein coating which is hard to break in to.

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14y ago

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