AP BIOLOGY

Detailed explanation-1: -These vaccines contain a version of the living virus or bacteria that has been weakened so that it does not cause serious disease in people with healthy immune systems. Because live, attenuated vaccines are the closest thing to a natural infection, they are good teachers for the immune system.

Detailed explanation-2: -Inactivated vaccines use the killed version of the germ that causes a disease. Inactivated vaccines usually don’t provide immunity (protection) that’s as strong as live vaccines. So you may need several doses over time (booster shots) in order to get ongoing immunity against diseases.

Detailed explanation-3: -Measles, Mumps and Rubella Viruses Two live attenuated vaccine strains have been mainly used since 1967: Jeryl Lynn and Urabe strain vaccines. Both are produced in chick embryo cell culture and are available in monovalent form or combined as MMR.

Detailed explanation-4: -They are made using killed or weakened versions of the disease-causing germ or parts of the germ (called antigens). For some vaccines, genetic engineering is used to make the antigens used in the vaccine.