Vaccination

Vaccinations stimulate an active immune response (Specific Immune Response), allowing the person to activate memory lymphocytes and produce antibodies without developing the disease.

• Once antibodies have been made against certain antigens, a few remain in the blood, which can trigger quicker immune response during infection.
• Moreover, certain T-cells and B-cells remember the specific antigens of pathogens and form memory lymphocytes. During next similar infection, memory B cells quickly differentiate and produce matching antibodies, while memory T cells rapidly multiply to destroy infected cells.

• Regular vaccinations are required because viruses mutate frequently. New strains may have new antigens the body cannot recognize.