has role antigen role antigen vaccine component vaccine antigen To create this term for cover some other vaccines such as cancer vaccine and so on. Oliver He This is a modified or partial form of the virus, bacteria or the toxin that causes the disease against which the vaccine protects. The vaccine antigen is altered from its original form so it no longer causes disease but it can produce an immune response.(Vaccine components FactSheet of NCIRS) Vaccine component that is used as antigen to produce an immune responce protect against the specific pathogen or disease. Asiyah Yu Lin vaccine component vaccine antigenic component