Active immunity refers to immunity generated by what mechanism?

Active immunity refers to immunity generated by what mechanism?

• A. Passive immunity
• B. Active immunity
• C. Colostral immunity
• D. Responsive immunity

Answer: (B)

Active immunity is immunity produced by the body's own response to an antigen. When the immune system encounters a pathogen or a vaccine, B cells become antibody-producing plasma cells and memory B cells, while T cells activate to help or kill infected cells. This process creates immunological memory, so future exposures trigger a faster, stronger response and often prevent illness. This is different from passive immunity, where antibodies are obtained from another source (such as maternal antibodies or immune globulin) and the recipient’s own immune system isn’t actively responding at the time. Colostral immunity is a form of passive transfer through colostrum. “Responsive immunity” isn’t a standard term for a recognized mechanism.

Active immunity is immunity produced by the body's own response to an antigen. When the immune system encounters a pathogen or a vaccine, B cells become antibody-producing plasma cells and memory B cells, while T cells activate to help or kill infected cells. This process creates immunological memory, so future exposures trigger a faster, stronger response and often prevent illness.

This is different from passive immunity, where antibodies are obtained from another source (such as maternal antibodies or immune globulin) and the recipient’s own immune system isn’t actively responding at the time. Colostral immunity is a form of passive transfer through colostrum. “Responsive immunity” isn’t a standard term for a recognized mechanism.