Role of Vaccination in Prevention of Diseases

Vaccination is a crucial concept covered in the 'Human Health and Disease' chapter of Class 12 NCERT. Here's how it helps in the prevention of diseases:

• Stimulation of Immune Response: Vaccines contain weakened or inactivated parts of a particular organism (antigen) that triggers an immune response within the body.
• Memory Cells Formation: The immune system produces memory cells after vaccination, which remain in the body. These cells recognize and combat the actual pathogen more effectively if it enters the body in the future.
• Herd Immunity: When a significant portion of the population is vaccinated, it helps in providing indirect protection to those who are not immune, thereby reducing the spread of diseases.
• Eradication of Diseases: Successful vaccination programs have led to the eradication or significant reduction in the prevalence of diseases like smallpox and polio.

Overall, vaccination is a powerful tool in the control and prevention of infectious diseases, contributing to the overall health of the community.