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

Viruses have evolved several strategies to evade the host's immune system and establish successful infections. Four common mechanisms employed by viruses to evade immune detection and response are:

1. Antigenic variation: Viruses can alter their surface proteins to escape recognition by the immune system, particularly by antibodies.
2. Inhibition of host immune responses: Some viruses can directly ________ _________ _______ _______ ________ ___ _____ _______.
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