[theold]

Antibodies do not last more than a couple of weeks in a given individual post-infection or post-vaccination. 

Data show that antibodies against the SARS-CoV-2 spike protein have failed to predict actual protection against reinfection or breakthrough infection.

T cells, another type of immune cell, represent the second arm of long-term immunity and can be amplified during infection to kill infected cells directly.

https://www.news-medical.net/news/202202...ancer.aspx