factually
Index/Topics/COVID vaccine spike protein persistence

COVID vaccine spike protein persistence

The duration for which the spike protein produced by COVID vaccines remains in the body, with some studies indicating it may persist for months in certain individuals.

Fact-Checks

2 results
Jan 28, 2026
Most Viewed

How long does spike protein from mRNA COVID vaccines remain detectable in blood by PCR or antigen tests?

Typical clinical and regulatory interpretations say or its mRNA from intramuscular mRNA COVID vaccines is detectable in blood for days to a few weeks after vaccination under routine assays, but highly...

Feb 1, 2026

How long does spike protein from mRNA or adenoviral COVID vaccines stay in the body?

The bulk of expert guidance and many clinical studies report that produced by or adenoviral COVID vaccines is present for a short period — typically days to a few weeks — as the injected mRNA or vecto...