The phase 2 and 3 trials actually involve injecting ‘volunteers’ with the vaccine. There is no other way to test. I don’t quite see the fundamental difference

The phase 2 and 3 trials actually involve injecting ‘volunteers’ with the vaccine. There is no other way to test. I don’t quite see the fundamental difference between injecting 15000 people or 150000. Or 1500000. Especially if they really want it.