Germany joins China and Taiwan in concluding that COVID-19 rarely spreads through casual contact

It spreads through repeated, large doses, such as you get while sheltering in place.

Of course, this neatly explains the pattern of outbreaks:

Wuhan (not China)
Kirkland (not Seattle)
Queens (not Manhattan)
Daegu (not Seoul)
Lombardy (not Rome)
Bunch of cruise ships

Etc. Etc.