There are 2 variants of this virus-S and L. L is more lethal. S is milder. S is the ancestor ie original new virus.
Possibly an explanation.
I wonder which strain these folks spread?
How an Upscale Connecticut Party Became a Coronavirus ‘Super Spreader’
About 50 guests gathered on March 5 at a home in the stately suburb of Westport, Conn., to toast the hostess on her 40th birthday and greet old friends, including one visiting from South Africa..
...The partygoers more than half of whom are now infected left that evening for Johannesburg, New York City and other parts of Connecticut and the United States, all seeding infections on the way...
Westport, a town of 28,000 on the Long Island Sound, did not have a single known case of the coronavirus on the day of the party. It had 85 on Monday, up more than 40-fold in 11 days.