They're finding out more about airborne spread as well. Initially they concentrated on droplets on surfaces being spread by touch but are now finding out that vaporized breath - not just cough spreading large droplets - can hang infectious levels of virus in the air for 30 minutes to 2-3 hours. Look up the story about the choir practice that infected over half the participants (30+ positive tests and a couple deaths thus far) even though there was no one there with symptoms and they practiced social distancing. This happened locally in Mt Vernon.