ANATOMY

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: -An antigen specifically induces the production of antibodies which can bind to it and neutralise it. While most vaccines work by inducing B lymphocytes to produce antibodies (see below), activation of T-cells-another type of immune system cell that helps protect against disease-is also important for some vaccines.

Detailed explanation-3: -Vaccines work by stimulating a response from the immune system to a virus or bacterium. This creates a ‘memory’ in the immune system. This immune memory allows the body to ‘remember’ a specific virus or bacterium, so that it can protect itself against this virus or bacterium and prevent disease that it causes.

Detailed explanation-4: -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-5: -Vaccines can help protect against certain diseases by imitating an infection. This type of imitation infection, helps teach the immune system how to fight off a future infection. Sometimes, after getting a vaccine, the imitation infection can cause minor symptoms, such as fever.