Biogen officials reached out to public health authorities in Massachusetts on March 3, according to a document obtained by the Globe, to report a cluster of about 50 conference attendees with flu-like symptoms in this region and overseas. Those officials were told that the cases did not satisfy requirements for testing.
— Read on www.bostonglobe.com/2020/03/11/nation/how-biogen-leadership-conference-boston-spread-coronavirus/