PATHOLOGY

Detailed explanation-1: -Live virus vaccines use the weakened (attenuated) form of the virus. The measles, mumps, and rubella (MMR) vaccine and the varicella (chickenpox) vaccine are examples. Killed (inactivated) vaccines are made from a protein or other small pieces taken from a virus or bacteria.

Detailed explanation-2: -Pathogens are microbes that cause diseases . Vaccines contain a dead or altered form of the disease-causing pathogen, which is introduced into the body. These dead or altered pathogens carry a specific antigen .

Detailed explanation-3: -Vaccines are made from microbes that are dead or inactive so that they are unable to cause disease. The antigen in the vaccine is the same as the antigen on the surface of the disease-causing microbe. The vaccine stimulates the body to produce antibodies against the antigen in the vaccine.