The South Korean study began with a mystery.

When a high school senior in Jeonju tested positive for COVID-19 on June 17, epidemiologists were stumped because the city hadn’t had a case in two months.

https://www.latimes.com/world-nation/story/2020-12-09/five-minutes-from-20-feet-away-south-korean-study-shows-perils-of-indoor-dining-for-covid-19
Researchers recreated the conditions at the restaurant and measured the airflow.

The high school student and a third diner who was infected had been sitting directly along the flow of air from an air conditioner

https://www.latimes.com/world-nation/story/2020-12-09/five-minutes-from-20-feet-away-south-korean-study-shows-perils-of-indoor-dining-for-covid-19
The study was published at a time when South Korea -- like many other countries -- is on edge amid a new wave of COVID-19 infections, with daily case rates hovering around 600 in recent days.

https://www.latimes.com/world-nation/story/2020-12-09/five-minutes-from-20-feet-away-south-korean-study-shows-perils-of-indoor-dining-for-covid-19
KJ Seung, an infectious disease expert, said the study was a reminder of the risk of indoor transmission as many nations hunker down for the winter.

The official definition of a “close contact” — 15 minutes, within six feet — isn’t foolproof.

https://www.latimes.com/world-nation/story/2020-12-09/five-minutes-from-20-feet-away-south-korean-study-shows-perils-of-indoor-dining-for-covid-19
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