NIH STUDY: 3 interventions had the most impact on COVID infections: closing schools, closing bars, wearing masks.

Here's Maryland where trajectory of case rate (green) hospitalizations (blue) and death (black) all change with a few days of lag time after closures 1/n

Researchers also looked at school closure, alone. Here's Georgia where school closure occurred prior to closing bars and appears to cut the rate of infections (green) in half, beginning 8-14 days post-closure. Rates of hospitalizations (blue) & death (black) also went down (2/n)

Mask mandates also led to a drop in the rate of infections (green); drops in the rates of hospitalizations (blue); and deaths (black) "Mandating masks is to drop the slopes about 2 fold". Here's New Jersey (3/n)

They found that post-opening surges seemed to be strongly correlate w/opening bars. Conversely, data suggests the simple combination of closing bars and wearing masks (see Red Arrows) was an effective way to clamp down rates. Here's Arizona (4/n)

Overall, school closings dropped infection rates in half; lockdowns dropped rates 3 to 4 fold; other actions (such as closing bars & mandating masks) brought the rates further down. Hospitalizations and deaths lagged, but paralleled cases. Preprint: (5/n) https://www.medrxiv.org/content/10.1101/2020.09.26.20202457v1