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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.
How long does the flu last? For most healthy people, the flu is an uncomfortable but short-term illness that resolves itself as the immune system fights it off. Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days. For people who've had a flu shot, the symptoms may last a shorter amount of time, or be less severe. For other people, the symptoms may last longer. Even when symptoms resolve, you may continue to feel fatigued. Some people are at increased risk for complications from influenza. 1  These people include: 2  the very young. 3  people 65 or older. 4  people with chronic illnesses, such as asthma, heart disease, HIV, or diabetes. 5  pregnant women. 6  people with a body mass index (BMI) of 40 or higher.