CHMP5 and COVID-19: 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).