28/09/2026
How Do Vaccines Create Long-Term Immunity?
Vaccines help the immune system prepare before an actual infection occurs. They introduce an antigen that triggers a specific immune response, activating lymphocytes and leading to the formation of memory cells.
When the body encounters the same antigen again, these memory cells enable a faster and stronger secondary immune response. 🧬🛡️
🎯 NEET Key Point:
Primary response → Memory cells → Faster & stronger secondary response
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