Most of the world has had 1 meter spacing for all, a few places had 1.5 meters, and North America and the UK had 2 meters. Like everything in epidemiology, its all random.
A new study published suggests that 3 feet may be as safe as 6 feet, provided that everyone is masked.
Source: CDC is considering shortening social distancing recommendations for schools to 3 feet, director says
There was never any science behind the six foot choice. In fact, no one even knows who made it up. Like everything else in epidemiology, it’s bogus.
