When polls get "down into the weeds" and show a result for 5% of the people or 10%, it really is chaff. About that percentage in polls just answer randomly, or as a joke, they just don't care. We used to "poll" people and insert a question like "Would you rather have $5 for completing this poll or $25?" and 10% would say $5. These were written questionnaires, so a bit different.
You also have 5% or so who say what they think you want to hear if done verbally as in a focus group interview.
If 20% of people will refuse to take a free vaccine, well, so be it. I'd be surprised if the figure is really that high in the longer run, especially if this thing goes ballistic.
Now I need to go sell some more stock. Gonna be a rough few months I suspect.