IMMUNOLOGY

Detailed explanation-1: -Vaccines help prevent infection by preparing the body to fight foreign invaders (such as bacteria, viruses, or other pathogens). All vaccines introduce into the body a harmless piece of a particular bacteria or virus, triggering an immune response. Most vaccines contain a weakened or dead bacteria or virus.

Detailed explanation-2: -A vaccine is a preparation that contains weakened or killed pathogens. It cannot cause a full-fledged infection but it can activate the immune system. The immune system prepares weapons against this pathogen and keeps them handy if at all the same pathogen attacks the body again. This is the basis of immunisation.

Detailed explanation-3: -Vaccines help reduce the risk of certain illnesses by introducing dead or weakened versions of disease-causing germs (bacteria or viruses) to the immune system which stimulate the production of antibodies to provide immunity against one or several diseases.

Detailed explanation-4: -The introduction of weak and dead microbes into the body is called vaccination. Vaccines are medicines that contain weakened or dead bacteria or viruses. When a person takes a vaccine, his or her immune system responds by producing antibodies substances that weaken or destroy disease-causing organisms.

Detailed explanation-5: -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-6: -Whole-Pathogen Vaccines Traditional vaccines consist of entire pathogens that have been killed or weakened so that they cannot cause disease. Such whole-pathogen vaccines can elicit strong protective immune responses. Many of the vaccines in clinical use today fall into this category.