February Biogen Conference In Boston Likely Caused 20,000 Coronavirus Cases, Report Says

Many coronavirus cases in the United States can be traced back to a Biogen conference that took place in Boston last February, but just how many?
It's likely that the one conference alone resulted in 20,000 coronavirus cases, according to a report cited by NBC Boston. If so, that means that one event was also responsible for many deaths in the country.