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Explain why antibiotics are more effective in curing bacterial diseases than viral diseases

Explain why antibiotics are more effective in curing bacterial diseases than viral diseases. 

Why taking an antibiotic is not effective in the common cold? 

Answer: Antibiotics are effective in curing bacterial and fungal infections (e.g. tuberculosis)  but they are ineffective in viral diseases (like common cold).

Antibiotics affect on life processes of bacteria and inhibit their growth. On the other hand virus is just a piece of DNA (or RNA), not a well defined life form.
Viruses can reproduce inside host cells. 

They do not use common biochemical pathways as used by other microbes (bacteria, fungi and parasites). That's why antibiotics are ineffective in viral
infections. 

It should be noted that despite this limitation, there are now effective anti-viral drugs, for example, the drugs that keep HIV infection under control.
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