The effectiveness of a mass quarantine

Hypothesis: The effectiveness of a mass quarantine is greatly reduced when the target population is given several hours’ advance notice of it.

Item (Wuhan):

A sudden overnight quarantine, with a 7-hour grace period for people to leave, has predictably led to this. Can an epidemic both be severe enough to justify a lockdown of 10m people and sufficiently under-control to allow this?

Item (Northern Italy):

There was chaos and confusion in the hours before Conte signed the decree, as word leaked to the news media about the planned quarantine. Students at the University of Padua in northern Italy who had been out at bars on a Saturday night saw the rumors on their cellphones and rushed back to their apartments to grab their belongings and head to the train station.

Hundreds of passengers, some wearing face masks and rubber gloves, crammed onto the last local train leaving Padua at 11:30 p.m. Anxious students wrapped scarves around their heads, shared sanitizing gel, and sat on their suitcases in the aisles. No conductor came by to check tickets.

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