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The immune system also develops a memory of the virus. So the next time the same virus invades our body, the immune system attack is even more effective. So for most viruses, the answer to your question is: not long. Within days or weeks, most viruses are gone from our blood.And from everywhere else in our bodies.But some viruses can hide inside certain cells in our bodies, and avoid being totally removed by the immune system.ome viruses can do this for a long time. Some can even cause a permanent, life-long infection. Fortunately, many viruses that can cause a life-long infection stay asleep inside our cells â not making copies of themselves, and not causing any illnesses. An example is the Epstein-Barr virus.
1 Most antibiotics leave your body in about 72 hours since the last administration....  2 Antiboitics take 2-3 weeks to leave youe system on average,they simply clean up the....  3 Different antibiotics last for different period of time....  4 So it will stay in your body for 2 1/2 days.... The half life of Bactrim is 12 hrs, so it will stay in your body for 2 1/2 days. But, once the allergic rash has started, the rash will sustain itself for 14 days. You`re on the appropriate treatment.. just make sure you drink a lot to flush the medicine out.