What measures are countries taking to stop it?
By Reality Check team BBC News
Countries around the world are taking different measures to try to stop the spread of coronavirus.
Governments say they are acting on medical and scientific advice from leading experts.
But the measures - and their timing - have varied widely, highlighting the many factors at play.
India says it's suspending visas for all foreigners for a month, with a few exemptions such as for diplomats, official or employment purposes.
Kuwait has also stopped issuing visas to foreign visitors.
And various countries around the world have now stopped or restricted entry to travellers from the countries worst affected by the virus, like China, Italy, Iran and South Korea.
Italy is now in a major lockdown, with special permission needed for travel within the country, and some countries have advised their nationals against non-essential travel there.
Spain is poised to declare a 15-day national lockdown, with its citizens allowed out only for emergencies or to work or buy food.
When the outbreak began in China, the authorities there restricted travel nationwide and told people to stay at home, only relaxing this recently.
The Iranian authorities have also tried to restrict travel between cities, but they did not seal off the holy city of Qom, where there were large numbers of cases.
The World Health Organization (WHO) advice is not to apply travel restrictions, except for a temporary period.
"In general, evidence shows that restricting the movement of people and goods during public health emergencies is ineffective in most situations," it said.
However, there are doubts about how effective screening for high temperatures is because coronavirus symptoms can take days to appear.
Airport temperature screening: some countries are doing it and some are not
Which countries are screening at airports?
Airports in Italy have been running temperature checks on passengers since early February, and there are also tests at railway stations. Thermometers are a common sight at airports throughout Asia.
And the US - as part of the travel restrictions announced on Europe - has said its citizens will be screened at designated airports.
South Korea has been carrying out more tests per head of population than anyone else, with nearly 20,000 people tested every day.
Compare that with an average of about 1,500 a day in England - although there are now plans to ramp this up to 10,000 daily.
The US has so far carried out even fewer tests, with reports of shortages at some health centres.
How severe the outbreak has been is another factor, with countries which see a spike in cases generally starting to increase the numbers they test.
School closures can be very disruptive socially and economically, and governments will be weighing up the pros and cons.
Ireland has announced it's closing its schools and colleges until 29 March, and there've been school closures at national or local level in other European countries.
In the UK and Germany, a relatively small number of schools have been closed temporarily to allow for deep cleaning after staff or pupils tested positive or returned from high-risk areas.
China closed schools in many areas, and Japan has asked all schools to close until the end of the school year, which is in late March.
Italy has closed all its schools until April as part of the nationwide lockdown. There have also been nationwide school closures in Iran, Iraq and Saudi Arabia.
In football, games were already being cancelled or played in empty stadiums but, after a number of players and coaches tested positive for the virus in different countries, the authorities have gone further.
Uefa have postponed all matches in the Champions League and the Europa League.
England's Premier League has been suspended (until 4 April) along with elite football in Spain, Portugal, France, Italy the Netherlands and a number of other countries.
Rugby Union's Six Nations matches, due to be played on 14 March between Italy and England and France and Ireland, were postponed.
The Indian Wells tennis tournament in California was cancelled after a public health emergency was declared for the Coachella Valley.
A number of marathons have been affected including the Barcelona marathon which has been moved from 15 March to 25 October. April's London marathon is also being postponed until October.
Meanwhile, Japan's Olympics Minister Seiko Hashimoto has said everything is being done to allow the Games to go ahead on 24 July, but said it could be delayed until later in the year.
The recent torch-lighting ceremony in ancient Olympia was held without spectators, before the rest of the relay in Greece was suspended.
The flame handover in Athens next week will be done behind closed doors because of coronavirus concerns.
Disney has announced that it is closing its theme parks in Florida and Paris. Hong Kong's Disneyland remains closed as do Disney theme parks in Japan.
There have also been temporary closures of tourist sites across Italy, and restrictions or new measures introduced for visitors to other attractions in Europe.
In France, the Louvre museum, the palace at Versailles and the Eiffel Tower have now been closed following a government order to ban gatherings of more than 100 people.
In New York, Broadway shows are being closed for a month while St Patrick's Day celebrations have been cancelled throughout the island of Ireland.
Saudi Arabia has temporarily halted the entry of pilgrims wanting to visit the holy sites, and Iraq introduced restrictions on access to religious sites.
By Reality Check team BBC News
Countries around the world are taking different measures to try to stop the spread of coronavirus.
Governments say they are acting on medical and scientific advice from leading experts.
But the measures - and their timing - have varied widely, highlighting the many factors at play.
Who is restricting travel and movement?
The US has introduced restrictions on 26 European countries, preventing anyone (except US citizens) from entering the country if they've been in Europe's border-free travel zone in the past 14 days, and is now extending this ban to include the UK and Republic of Ireland.India says it's suspending visas for all foreigners for a month, with a few exemptions such as for diplomats, official or employment purposes.
Kuwait has also stopped issuing visas to foreign visitors.
And various countries around the world have now stopped or restricted entry to travellers from the countries worst affected by the virus, like China, Italy, Iran and South Korea.
Italy is now in a major lockdown, with special permission needed for travel within the country, and some countries have advised their nationals against non-essential travel there.
Spain is poised to declare a 15-day national lockdown, with its citizens allowed out only for emergencies or to work or buy food.
When the outbreak began in China, the authorities there restricted travel nationwide and told people to stay at home, only relaxing this recently.
The Iranian authorities have also tried to restrict travel between cities, but they did not seal off the holy city of Qom, where there were large numbers of cases.
The World Health Organization (WHO) advice is not to apply travel restrictions, except for a temporary period.
"In general, evidence shows that restricting the movement of people and goods during public health emergencies is ineffective in most situations," it said.
Who is screening at airports?
Some countries - if they are not barring entry - are screening arrivals at airports and other transport hubs. This can involve questioning travellers about their recent movements, their health and carrying out temperature checks.However, there are doubts about how effective screening for high temperatures is because coronavirus symptoms can take days to appear.
Airport temperature screening: some countries are doing it and some are not
Which countries are screening at airports?
Airports in Italy have been running temperature checks on passengers since early February, and there are also tests at railway stations. Thermometers are a common sight at airports throughout Asia.
And the US - as part of the travel restrictions announced on Europe - has said its citizens will be screened at designated airports.
How many tests are being carried out?
There is considerable variation in how many people are being tested for coronavirus around the world.South Korea has been carrying out more tests per head of population than anyone else, with nearly 20,000 people tested every day.
Compare that with an average of about 1,500 a day in England - although there are now plans to ramp this up to 10,000 daily.
The US has so far carried out even fewer tests, with reports of shortages at some health centres.
How severe the outbreak has been is another factor, with countries which see a spike in cases generally starting to increase the numbers they test.
Who has closed schools and colleges?
The UN's educational, scientific and cultural body Unesco says that as of 13 March, 39 countries had closed all their schools. A further 22 had closed some at a local level.School closures can be very disruptive socially and economically, and governments will be weighing up the pros and cons.
Ireland has announced it's closing its schools and colleges until 29 March, and there've been school closures at national or local level in other European countries.
In the UK and Germany, a relatively small number of schools have been closed temporarily to allow for deep cleaning after staff or pupils tested positive or returned from high-risk areas.
China closed schools in many areas, and Japan has asked all schools to close until the end of the school year, which is in late March.
Italy has closed all its schools until April as part of the nationwide lockdown. There have also been nationwide school closures in Iran, Iraq and Saudi Arabia.
What about sporting events?
Coronavirus is having a major impact on the sporting calendar.In football, games were already being cancelled or played in empty stadiums but, after a number of players and coaches tested positive for the virus in different countries, the authorities have gone further.
Uefa have postponed all matches in the Champions League and the Europa League.
England's Premier League has been suspended (until 4 April) along with elite football in Spain, Portugal, France, Italy the Netherlands and a number of other countries.
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Rugby Union's Six Nations matches, due to be played on 14 March between Italy and England and France and Ireland, were postponed.
The Indian Wells tennis tournament in California was cancelled after a public health emergency was declared for the Coachella Valley.
A number of marathons have been affected including the Barcelona marathon which has been moved from 15 March to 25 October. April's London marathon is also being postponed until October.
Meanwhile, Japan's Olympics Minister Seiko Hashimoto has said everything is being done to allow the Games to go ahead on 24 July, but said it could be delayed until later in the year.
The recent torch-lighting ceremony in ancient Olympia was held without spectators, before the rest of the relay in Greece was suspended.
The flame handover in Athens next week will be done behind closed doors because of coronavirus concerns.
Are museums and tourist attractions still open?
Some of the world's most famous visitor attractions have closed, restricted entry or told visitors to minimise close contact with each other.Disney has announced that it is closing its theme parks in Florida and Paris. Hong Kong's Disneyland remains closed as do Disney theme parks in Japan.
There have also been temporary closures of tourist sites across Italy, and restrictions or new measures introduced for visitors to other attractions in Europe.
In France, the Louvre museum, the palace at Versailles and the Eiffel Tower have now been closed following a government order to ban gatherings of more than 100 people.
In New York, Broadway shows are being closed for a month while St Patrick's Day celebrations have been cancelled throughout the island of Ireland.
Saudi Arabia has temporarily halted the entry of pilgrims wanting to visit the holy sites, and Iraq introduced restrictions on access to religious sites.