PATHOLOGY

Detailed explanation-1: -A vaccine provides a controlled exposure to a pathogen, training and strengthening the immune system so it can fight that disease quickly and effectively in future. By imitating an infection, the vaccine protects us against the real thing.

Detailed explanation-2: -How do vaccines work? Vaccines help your immune system fight infections faster and more effectively. When you get a vaccine, it sparks your immune response, helping your body fight off and remember the germ so it can attack it if the germ ever invades again.

Detailed explanation-3: -When a person gets a vaccine, their immune system recognises the antigen as foreign. This activates the immune cells so that they kill the disease-causing virus or bacterium and make antibodies against it.