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The immune system is a network of biological systems that protects an organism from diseases. It detects and responds to a wide variety of pathogens , from viruses to bacteria , as well as cancer cells , parasitic worms , and also objects such as wood splinters , distinguishing them from the organism's own healthy tissue .
The five cardinal signs are heat, pain, redness, swelling, and loss of function (Latin calor, dolor, rubor, tumor, and functio laesa). Inflammation is a generic response, and therefore is considered a mechanism of innate immunity, whereas adaptive immunity is specific to each pathogen. [2]
Correlates of immunity or correlates of protection to a virus or other infectious pathogen are measurable signs that a person (or other potential host) is immune, in the sense of being protected against becoming infected and/or developing disease. For many viruses, antibodies and especially neutralizing antibodies serve as
Strong immunity, a common genetic thread. Her team discovered a common genetic thread: a gene called HLA-B*15:01. People who have this HLA version were more than twice as likely to have an ...
For months, scientists, public health officials, politicians and the general public have debated whether prior coronavirus infection — touted as "natural immunity" — offers protection against ...
A newly developed blood test that measures the activation of T cells in the body could help doctors gauge how much immunity a person has against Covid-19.