True, same here, in The Netherlands. Of the first 500 reported cases, around 25% were tourists returning from the Alps region (northern Italy, western Austria),

True, same here, in The Netherlands. Of the first 500 reported cases, around 25% were tourists returning from the Alps region (northern Italy, western Austria), and around 50% were traced to secondary infections from those first 25%. The other 25% were unexplained, hence we're now in the endemic spread phase. FAFAIK, we've never had a policy to pre-emptively test every returning tourist, and even now we don't test everybody. The current policy is to test new cases only if they have no relation to an already-established case. For example, people living in the same house as a known Corona case will not get tested. If they start showing symptoms, they're automatically assumed to have contracted it.