But while the waters of the lagoon were a corridor for the passage of an epidemic, they were also a natural cordon sanitaire that facilitated an efficient quarantine system as a bulwark against the disease for the rest of Italy. (TIME)

In addition to a cordon sanitaire, which halted travel into or out of the affected areas, the lockdown prohibited the sixteen million people living inside the so-called zone rosse from any movement that was not required for work, health, or other “necessary” reasons. (The New Yorker)

The first thing is the strong-arm methods introduced by the Chinese on January 23rd, when they introduced cordon sanitaire, which is a wholesale quarantine by cordoning off with soldiers and policemen whole geographical areas and communities. (The New Yorker)