The immune system is the sum of the processes that protect a living thing against diseases, recognize viruses and destroy them. The system scans the foreign proteins that viruses come into contact with in the living body and distinguishes them from the living body’s healthy body cells and tissues. The immune system can distinguish even substances with very similar properties from each other, for example; It has the ability to distinguish even proteins that differ in one amino acid from each other. This distinction is complex enough to cause viruses to find new ways and make some adaptations to infect despite the host’s defense system. In order to survive in this struggle, some mechanisms have developed that recognize viruses and neutralize them. All living things in nature have defense systems against tissues, cells and molecules that are not their own.
Many strategies are used by viruses to evade in vivo response and host immunity. It is particularly associated with the host being exposed to attacks by the inflammatory system and immune response.