Humans are constantly surrounded by pathogens— disease-causing organisms such as bacterium, virus, parasite, or fungus— whether in the environment or within our bodies. Susceptible individuals who encounter harmful pathogens are at risk of developing life-threating diseases. Fortunately, the body is readily equipped with an immune system— a system capable of developing a series of protective defenses against pathogens as a natural response.
Immune System Mechanisms
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