It would be inefficient for the body to maintain antibodies for things that don’t harm it.
The body doesn’t “maintain” antibodies: They are a response to infection. They do decline, but their decline does not translate to a vulnerability.
T-cells are result of an infection...the ‘memory’ cells...the ‘first responders’ of reinfection.
This ‘antibody’ talk is just mass manipulation of a public which understands nothing of immunology, to state nothing of virology and the impossibility of trapping a virus with a loose-fitting paper or cloth facial covering.