
To describe:
Three mechanisms that allow pathogens to evade immune system.
Introduction:
Pathogens are infectious organisms that infect any of their host organisms, and they reside, grow and multiply in the host. They use the

Explanation of Solution
There are some ways in which a microorganism can evades from the attack of host’s immune system. They are as follows:
1. Some microorganisms evade the immune system of the host by antigenic drift. The process of genetic drift refers to the change that occurs in the genome of the organism due to mutation. This is more common in viruses.
2. Some microorganisms change the surface molecules by the process of antigenic variations. For example, malarial
3. Some microorganisms grow slowly and thus remain unrecognized by the host immune system. Thus, they evade the attack of cells from the host immune system.
The three ways in which microorganisms evade the attack of immune system of host are: antigenic variation, antigenic drift and slow growth.
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