Innate Immunity is a nonspecific host defense mechanism against foreign antigens. It is the first line of defense in a host and occurs immediately or within hours after exposure. This type of immunity ...

The complement system is a key component of innate and adaptive immunity and therefore acts as a vital defense against invading pathogens. Deficiencies in the complement system are associated with ...

It is part of the innate immune system and normally helps to fight infections and eliminate damaged and infected body cells. "In patients with Long Covid, the complement system no longer returns to ...