Name four mechanisms employed by viruses to evade immune system of host. Briefly discuss any one of these.

Viruses have evolved several mechanisms to evade the host immune system and establish infection. Four of these mechanisms are:

1. Antigenic variation: Viruses frequently alter their surface proteins to evade detection by the immune system, particularly antibodies.
2. Inhibition of antigen presentation: Some viruses interfere with the ______ _________ ______ _____ ________.
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