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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.
There was also an experiment done to test how long norovirus remained infections in ground water. It remained infectious for 2 months and then they stopped checking4. Answer: The stomach flu viruses can live on surfaces for about 2 weeks.Once everyone in your house is done being sick, it is reasonable to assume that you will have stray viruses lingering on household surfaces for another 2 weeks.Norovirus has been shown to live on kitchen counter tops for at least 7 days1.t remained infectious for 2 months and then they stopped checking4. Answer: The stomach flu viruses can live on surfaces for about 2 weeks. My in-laws had a bad case of the stomach flu on December 18-19, 2009. They were well by December 20.