The Spike protein is the “key” the virus uses to enter human cells. Most vaccines (like Pfizer, Moderna, and Oxford-AstraZeneca) and natural infections teach your body to recognize this specific protein.
- IgG (Immunoglobulin G): These are “late-phase” antibodies that typically appear 2–3 weeks after vaccination or infection and can remain in the blood for many months.
- The Quantitative Result: This test often provides a numerical value (titer), allowing you to see the strength of your immune response over time.
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