These organizations were dead wrong, and it had severe consequences for the spread of infection. There really does not seem to be good evidence for this state

These organizations were dead wrong, and it had severe consequences for the spread of infection. There really does not seem to be good evidence for this statement, and I've looked although not exhaustively. Got any good primary sources? Lot's of things are tried with a novel virus, and only some of them work. The only things so far that seem to be clearly working are distancing regulations and effective contract trace, the latter being very difficult to implement.