American Sign Language (ASL) is a natural language that serves as the predominant sign language of Deaf communities in the United States and most of anglophone Canada.
Adaptive immunity refers to antigen-specific immune response. The adaptive immune response is more complex than the innate. The antigen first must be processed and recognized. Once an antigen has been recognized, the adaptive immune system creates an army of immune cells specifically designed to attack that antigen.
active immunity, a form of long-term, acquired immunity. It protects the body against a new infection as the result of antibodies that develop naturally after an initial infection or artificially after a vaccination. Compare passive immunity. See also acquired immunity, immune response, natural immunity.ctive immunity. that which follows exposure to an antigen; acquired immunity attributable to the presence of antibody or of immune lymphoid cells formed in response to antigenic stimulus. Called also adaptive immunity.