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Immune System

Across
A substance that triggers an immune response
A disease causing agent
A nonspecific defense reaction to tissue damaged cause by infection
A protein that helps destroy pathogens
Proteins that help cells resist viral infections
Immunity produced by a vaccine
Down
The second line of defense
An injection of a weakened form of a pathogen
You will never develop the disease again
A body's specific defense to a pathogen
First line of defense