1/ As we approach #July4th, we must acknowledge that this Independence Day *MUST* be unlike any we've ever experienced. Many of the common July 4th activities carry high risk of #COVID19, as beautifully depicted by two recently developed COVID risk indexes.
— Jonathan Marron MD MPH (@JonMarronMD) July 3, 2020
A short 🧵 on these: pic.twitter.com/KeRirlEaDN
Be informed. Know your risk. Stay safe. pic.twitter.com/t6G71wAHU6
— Texas Medical Association (@texmed) July 3, 2020
4要素（密閉度・密集度・接触時間・飛沫の有無）で評価，各活動のCOVID-19リスク pic.twitter.com/FbeG4lVeyv
— Spica (@Kelangdbn) July 5, 2020
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