An antigen is the name for the pathogen or invader. It can trigger an immunological response and is perceived as a threat by the immune system. Antigens are proteins that are present on the pathogen's surface.
What exactly does the invasion of microbes in a tissue mean?
When a bacterium infiltrates and starts to multiply within a host, an infection is caused. Disease develops when a bacterium invades a tissue and spreads, impairing its ability to function.
What do you call an organism that enters the body?
A microorganism with the potential to cause disease is referred to as a pathogen. The invasion and proliferation of pathogenic bacteria in an individual or group is referred to as an infection. Disease is when an infection compromises a person's critical systems or functions. Disease is not usually the outcome of an infection.
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