The spike protein outer shell of the coronavirus contains "prion-like regions" that give the virus very high adhesion to ACE2 receptors in the human body. This has been documented by a study entitled, "SARS-CoV-2 Prion-Like Domains in Spike Proteins Enable Higher Affinity to ACE2," published by the Human Microbiology Institute: The presence and unique distribution of prion-like domains in the SARS-CoV-2 receptor-binding domains of the spike protein is particularly interesting, since although the SARS-CoV-2 and SARS-CoV S proteins share the same host cell receptor, angiotensin-converting enzyme 2 (ACE2), SARS-CoV-2 demonstrates a 10- to 20-fold higher affinity for ACE2 The mRNA vaccine works by hijacking your body's cells and causing them to churn out proteins modeled after the spike proteins in the SARS-cov-2 coronavirus.