Immune cells recognize antigens
B cells and T cells respond to molecular features associated with a pathogen or vaccine.
Memory cells persist
After an immune response, some cells remain and can respond more rapidly later.
Vaccination creates memory without the disease it is designed to prevent
Vaccines present antigens or instructions for antigens in ways intended to train protective immunity.
Protection is not identical for every vaccine or person
Duration and type of immunity depend on the pathogen, vaccine and individual response.
Source trail: NIAID: immune-system overview
This page explains scientific concepts for general learning. It does not replace laboratory safety procedures, professional engineering guidance, or individualized medical advice.