The shared immunity between vaccine-preventable childhood diseases and COVID-19 was based on the homology sequence similarity of the 30 amino acid residues between the Spike (S) glycoprotein of the SARS-CoV-2 virus with the Fusion (F1) glycoprotein of Measles virus (residues R3389 to K419), and the envelope (E1) glycoprotein of the Rubella virus (residues A444 to K473). This evidence concerns the gene ART4 and COVID-19.