Matt Yglesias has a very perceptive tweet:
There are various ways of reading this tweet, but here’s my take:
There are pros and cons of the herd immunity strategy.
There are pros and cons of challenge trials for a vaccine.
Perhaps we should do both, perhaps neither.
But the case for challenge studies is clearly far stronger than the case for herd immunity.
Every criticism of challenge studies applies 10 or 100-fold for herd immunity.
People like Alex Tabarrok keep banging the drums for challenge studies, but is anyone paying attention? (Maybe its too late.)