Countries around the world are implementing measures to slow the spread of the novel coronavirus, from national quarantines to closing schools.

After a surge in COVID-19 cases in Italy, Prime Minister Giuseppe Conte of Italy put the entire country on lockdown, restricting travel, leisure, work, churchgoing, and other aspects of life for its 60 million citizens.

Italy has the highest coronavirus death toll in the world outside China: At least 15,000 people have been infected and more than 1,000 have died there, according to The New York Times.

Italy's lockdown may be the largest quarantine outside of China, where almost half of China's population about 780 million people were under some kind of travel restriction, according to a February 17 estimate by CNN.

El Salvador has imposed a national quarantine on its population of 6.4 million people and banned foreigners from entering the country despite having no confirmed cases of the virus so far.

The World Health Organization (WHO), which officially declared the outbreak a pandemic this week, has called on "all countries to continue efforts that have been effective in limiting the number of cases and slowing the spread of the virus."

While "lockdown" isn't a technical term used by public health officials , it can refer to anything from mandatory geographic quarantines to non-mandatory recommendations to stay at home and closures of certain types of businesses or bans on events and gatherings, Lindsay Wiley, a health law professor at the Washington College of Law, told Vox.

Here are the countries that have implemented mandatory mass quarantines so far.

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