In contrast, Tetanus, Mumps, Hepatitis B and BCG antigenic proteins showed no more than one similar segment with SARS-CoV-2 proteins (Table1). Among the described peptides, seven were similar to others in the S protein of SARS-CoV-2 and were identified in the antigenic proteins in poliovirus Sabin 3, S pneumoniae, tetanus, Mumps, Hepatitis B and Hib vaccines. The gene discussed is PROS1; the disease is tetanus.