"Now that we have safe, effective vaccines, we can give people immunity without causing dangerous disease. That puts us into a global race against the virus. The more people who see the vaccine before they see SARS-CoV-2, the fewer severe cases, long-term health problems, and deaths. Faster worldwide rollout will save lives. It really is that simple."A great explanation of why it's the novelty of the coronavirus that makes it deadly and explains some of its seemingly unique properties.