The coronavirus' impact on infrastructure has been notable in China. Beginning on January 23, Wuhan, a city of 11 million people, where the coronavirus was first discovered, has been on lockdown. Police closed entry points into the city, and have been patrolling the city's train stations.
Other than for several hours where the quarantine was briefly lifted before being reimposed, the quarantine has been constant. The mass quarantine escalated in early February, when the Chinese government put another 15 cities, with about 35 million people, on lockdown. It's the largest quarantine in human history.
Outside of Asia, Italy, which has become the epicenter of the coronavirus in Europe, has also been using its law enforcement to deal with the coronavirus.
In northern Italy, 11 quarantined towns are surrounded around the clock by military police, to try and stop the coronavirus from spreading.
Police have also been monitoring two resorts on lockdown in Europe — one hotel called the Costa Adeje Palace, with more than 450 rooms in Tenerife, Spain, which is on lockdown for two weeks, and another in a ski resort with 108 rooms in Innsbruck, Austria.
If quarantines are enacted in the US, they'd be under the jurisdiction of the CDC. The agency already screens passengers at airports and other ports of entry for diseases (and has been doing so for coronavirus), and could enforce isolation and quarantines throughout the country or in specific areas to prevent the spread of COVID-19.