Compulsory mass vaccination using the current vaccines poses a serious public health risk [1][2][3]. See my other comments here for more explanation and citations. For these reasons, vaccination strategies should be highly targeted towards vulnerable populations, and should be heavily supplemented by additional therapeutic modalities.
> and a mass antibodies level testing program at the same time
Antibody levels are used as proxy for protection [4], but higher levels of antibodies do not necessarily always translate to higher levels of protection. In fact, individuals with undetectable levels of antibodies can still have robust and durable immunity [5][6][7]. There is plenty of literature on antibody levels reducing with time [8][9], but again, antibody levels are only one aspect of a complex immune response.
[1] Risk of rapid evolutionary escape from biomedical interventions targeting SARS-CoV-2 spike protein https://pubmed.ncbi.nlm.nih.gov/33909660/
[2] Can we predict the limits of SARS-CoV-2 variants and their phenotypic consequences? https://www.gov.uk/government/publications/long-term-evoluti...
[3] Why does drug resistance readily evolve but vaccine resistance does not? https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2016...
[4] SARS-CoV-2 antibody-positivity protects against reinfection for at least seven months with 95% efficacy https://pubmed.ncbi.nlm.nih.gov/33937733/
[5] SARS-CoV-2 infection induces long-lived bone marrow plasma cells in humans https://www.nature.com/articles/s41586-021-03647-4.pdf
[6] Longitudinal analysis shows durable and broad immune memory after SARS-CoV-2 infection with persisting antibody responses and memory B and T cells https://www.cell.com/cell-reports-medicine/fulltext/S2666-37...
[7] Rapid induction of antigen-specific CD4+ T cells is associated with coordinated humoral and cellular immune responses to SARS-CoV-2 mRNA vaccination https://www.cell.com/immunity/fulltext/S1074-7613(21)00308-3
[8] Antibody Responses 8 Months after Asymptomatic or Mild SARS-CoV-2 Infection https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7920668/
[9] Naturally enhanced neutralizing breadth against SARS-CoV-2 one year after infection https://www.nature.com/articles/s41586-021-03696-9