IMMUNOLOGY

Detailed explanation-1: -Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.

Detailed explanation-2: -Finally, when people receive a vaccine, some may experience some mild symptoms for a day or two, such as a fever, chills, or fatigue. This does not mean that you’re infected with a virus or other pathogen. Rather, your body acts as if it’s fighting a mild form of the germ and produces a related immune response.

Detailed explanation-3: -Indicated for infants above the age of six weeks and of pre-school children against diphtheria, tetanus and pertussis (whooping cough).

Detailed explanation-4: -Another way to produce active immunity is by vaccination. Vaccines contain antigens that stimulate the immune system to produce an immune response that is often similar to that produced by the natural infection. With vaccination, however, the recipient is not subjected to the disease and its potential complications.