Could COVID-19 immunity last for 17 YEARS?
T cells are a type of white blood cell that are a key component of the immune system and help fight off disease.When the body is invaded by bacteria, a virus, such as SARS-CoV-2, or parasites, an immune alarm goes off, setting off a chain reaction of cellular activity in the immune system.They are part of the adaptive immune system, which is considered the more specialised response. They use past interactions to remember foreign threats and how to attack them.
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