Very interesting study.
“We found that superspreading has overwhelmingly contributed to the transmission of SARS-CoV-2 in the city overall.
Of the 349 local cases we identified — the remaining 689 cases were imported from other territories — 196 were linked to just six superspreading events. One person alone appears to have infected 73 individuals after frequenting several bars in late March. Weddings, temples, hot-pot dinners, work parties and karaoke venues featured in the other clusters.”
“In our study, just 20 percent of cases, all of them involving social gatherings, accounted for an astonishing 80 percent of transmissions. (That, along with other things, suggests that the dispersion factor, k, of SARS-CoV-2 is about 0.45).”
“Another 10 percent of cases accounted for the remaining 20 percent of transmissions — with each of these infected people on average spreading the virus to only one other person, maybe two people. This mostly occurred within households.”
“No less astonishing was this corollary finding: Seventy percent of the people infected did not pass on the virus to anyone.
“Now you might be wondering if our study, or the experience of Hong Kong, with its small number of total infections, is more broadly representative. We think so.”
“But the record in both places, and elsewhere, points to the same conclusion: It’s not just that superspreading events are happening with SARS-CoV-2; they appear to be driving much of the pandemic.”
This fact is alarming and reassuring at the same time.
“It’s alarming because it suggests a virus swift and efficient, and so seemingly unstoppable.”
“But the considerable role of superspreading in this pandemic should be reassuring, too, because it also suggests a way to stop SARS-CoV-2 that is both less onerous and more effective than many of the strategies that have been pursued so far.”
“The epidemic’s growth can be controlled with tactics far less disruptive, socially and economically, than the extended lockdowns or other extreme forms of social distancing that much of the world has experienced over the past few months.”
“Forget about maintaining — or, if infections resurge, resuming — sweeping measures designed to stem the virus’s spread in all forms. Just focus on stopping the superspreading.”
https://www.nytimes.com/2020/06/02/opinion/coronavirus-superspreaders.html?action=click&module=Opinion&pgtype=Homepage