This is the best article I have read about the COVID-19 vaccines. Two of the vaccines that have completed Phase III trials will soon become available to those in the top priority groups–frontline healthcare workers and first responders, plus those who are at higher risk because of their age; and those who have underlying conditions that increase their risk for severe disease. This superb article explains how the vaccines are being produced, tested, how they actually protect against the disease and many other key issues.