Researchers find people who have recovered from Covid have similar spike protein antibody levels whether they were infected 20 days or 20 months ago.
A new report in the Journal of the American Medical Association finds more good news for unvaccinated people who have already had and recovered from Covid.
Anti-spike protein antibodies following Covid infection and recovery seem to persist indefinitely in unvaccinated people, researchers found. People tested 20 months after coronavirus infection had slightly higher levels of antibodies on average than those just after infection.
The key chart: the flat yellow line shows that people with natural immunity seem to have the same level of antibodies no matter when they were infected.