The United States and countries across Europe are closing schools, entertainment venues and all but essential services, as they step up efforts to combat the coronavirus pandemic.
Schools in New York City have been shut with classes moved online, and entertainment venues have been ordered to close from Tuesday, as officials increasingly turn to quarantine measures to tackle a virus that has now killed 5,800 people around the world.
Governments are also limiting travel - both inward and outward - to curb the movement of people and introducing new restrictions on arrivals from overseas. South Korea and China, both wary of imported infections, have tightened requirements for international arrivals.