In case you are wondering how important individual impact is on societal COVID19 spread, read this story about Patient 31 in South Korea, who singlehandedly may be responsible for 80% of cases over a period of time. graphics.reuters.com/CHINA-HEALTH-S…
Over 8 days, she visits church twice and went to a buffet lunch with a friend BEFORE testing positive. 2/n
The Korea Centers for Disease Control & Prevention (KCDC) obtained a list of 9,300 people who had attended those two church services, around 1,200 of whom had complained of flu-like symptoms. Hundreds of cases have now been confirmed there. 3/n
A 2nd major cluster emerged from a nearby hospital near Daegu, where she visited.
If confirmed, it means Patient 31 could be linked to both clusters. Between Daegu and Cheongdo county, the areas account for around 80% of the cases in the entire country. 4/n
If confirmed, it means Patient 31 could be linked to both clusters. Between Daegu and Cheongdo county, the areas account for around 80% of the cases in the entire country. 4/n
Daegu and Gyeongbuk, where she visited, have by far the most cases. Seoul, a metropolitan area of more than 25 million people, has only a small portion. 5/n 
Obviously the exact source of spread is impossible to tell. But today, for any single person, going anywhere with large crowds, even if asymptomatic, is irresponsible and dangerous, and could drive exponential spread of COVID19. #flatteningthecurve by #SocialDistancing 6/6
Another supernode case, here in the US:
