system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why we can't cure viruses (like herpes)
gpt
Other parasites can be killed through either poison, suffocation, or destroying their cells. Viruses are not complete cells nor do they breath or eat like other organisms, they are just DNA or RNA invading someone else's cells, therefore killing them is very difficult without damaging the patient. Probably the most effective way of treating virus is preventing it from reproducing, and scientists are able to come up with drugs that suppresses the replication of viruses (but not eliminating the virus). 

Another reason is many viruses mutates extremely quickly, by the time a cure is found it would be obsolete again.