An example of artificial active immunity is building up a resistance to a disease due to an immunization. An allergic reaction is an extreme response to an antigen, resulting from active immunity. Features of Active Immunity. Active immunity requires exposure to a pathogen or to the antigen of a pathogen.
The adaptive immune system, also known as the acquired immune system or, more rarely, as the specific immune system, is a subsystem of the overall immune system that is composed of highly specialized, systemic cells and processes that eliminate pathogens or prevent their growth.
Innate (natural) immunity is so named because it is present at birth and does not have to be learned through exposure to an invader. It thus provides an immediate response to foreign invaders. However, its components treat all foreign invaders in much the same way.
CDC recommends all children get two doses of MMR (measles-mumps-rubella) vaccine, starting with the first dose at 12 through 15 months of age, and the second dose at 4 through 6 years of age. Children can receive the second dose earlier as long as it is at least 28 days after the first dose.
passive immunity of the cell-mediated type conferred by the administration of sensitized lymphocytes from an immune donor to a naive recipient. artificial immunity includes acquired (active) immunity produced by deliberate exposure to an antigen, such as a vaccine or the administration of antibody (passive).
Most babies experience infection with several strains of rotavirus in the first years of life and develop antibodies that lead to natural, lifelong immunity to the infection. In the U.S., rotavirus infection very rarely leads to serious complications or death if appropriate medical care, including re-hydration and nutrition support, is given.
Two doses of varicella vaccine are recommended for all children, adolescents, and adults without evidence of immunity to varicella. Those who previously received one dose of varicella vaccine should receive their second dose for best protection against the disease.