the function of the system.
pathogen or infectious agent is a biological agent that causes disease or illness to its host.
the immunity that results from the production of antibodies by the immune system in response to the presence of an antigen.
the short-term immunity that results from the introduction of antibodies from another person or animal.
a toxin or other foreign substance that induces an immune response in the body, especially the production of antibodies.a blood protein produced in response to and counteracting a specific antigen.
Viruses can not be killed by antibiotics because viruses lack metabolic pathways
Pain: in the back, muscles, or joints