[jsnell]

> For example, Sweden had school breaks around the time of the large outbreaks in northern Italy and Austria, leading to many ski vacations to those areas. Did the other Nordics?

Yes, Norway and Denmark had ski vacations at the same time with a lot of travel to the Alps. All three countries had very similar initial conditions and trajectories for the epidemic until early April. The differences in outcomes were clearly related to policy decisions made in March and April.