"Vaccines are hard to develop, and can be dangerous. This is a vaccine for a disease where 40% (at current estimate, up from 35% before) have no symptoms, and where only about .4% die. It’s also a widespread disease — this isn’t Ebola where you could vaccinate 50,000 people and bring an outbreak to an end. You’d have to vaccinate a billion or more. When you vaccinate huge numbers of people for a disease that isn’t very dangerous, your vaccine has to be very safe to be better than the disease. That doesn’t go well with a rushed development effort."
Quoted convincingly at Instapundit with links beyond. July 14 2020
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