[Answer] How to extracellular pathogens escape the immune system?

Answer: phagocyte avoidance mechanisms
How to extracellular pathogens escape the immune system?
Antigenic variation allows pathogens to escape from immunity. One way in which an infectious agent can evade immune surveillanceis by alteringits antigens; this is particularly important for extracellular pathogens against which the principal defense is the production of antibodyagainst theirsurface structures.
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