AFAIK the impact of asymptomatic transmission is still under debate. The bigger danger seems to be presymptomatic transmission. But my info may be a few months

AFAIK the impact of asymptomatic transmission is still under debate. The bigger danger seems to be presymptomatic transmission. But my info may be a few months out of date, would be interested if anyone has any sources saying otherwise? Still though I agree it would have been useful to regularly test all trial participants - the US really could have done a lot better job with testing more generally.