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A fast-moving virus originating in China and known as the "new coronavirus" has infected tens of thousands of Chinese citizens and spread to about 50 countries. It has claimed nearly 3,000 lives so far.
Here are 11 maps and charts that will help you understand what is going on.
Almost 80,000 people in China have been infected with the coronavirus - known officially as Covid-19 - since the virus's discovery in the city of Wuhan, Hubei province, in December.
Although the vast majority of cases of the respiratory infection, which causes pneumonia-like symptoms, remain in China, the virus is now spreading faster outside the country than inside.
Coronavirus has infected more than 4,300 people across the globe, according to World Health Organization (WHO) figures.
However, infectious disease specialists at Imperial College London estimate about two thirds of COVID-19 cases originating in mainland China remain undetected worldwide.
This could mean "multiple chains of as yet undetected human-to-human transmission" internationally, they say.
The three biggest international outbreaks detected so far have been in South Korea, with more than 2,000 cases, on board the British-registered Diamond Princess cruise ship docked in Yokohama, Japan, which has seen more than 700 people infected, and Italy, with more than 640 confirmed cases.
In a sign the disease is spreading further afield, Brazil announced Latin America's first case on Thursday and the first cases in Africa have been confirmed in Algeria, Egypt and Nigeria. New Zealand has also confirmed its first case.
Within Europe, Austria, Croatia, Greece, Norway, Switzerland, Georgia and North Macedonia have reported their first cases, while more infections have been announced in Spain, France and Germany.
On the Spanish island of Tenerife, up to 1,000 guests have been locked down in a hotel after an Italian doctor and his wife tested positive.
Governments across Europe are stepping up preparations, as more cases are detected.
2. The virus has pandemic potential
The jump in the number of daily confirmed cases internationally has raised fears the outbreak could become a pandemic - when an infectious disease spreads easily from person to person in many parts of the world.
The spread has reached a "decisive point" and has "pandemic potential", WHO head Dr Tedros Ghebreyesus says.
Dr Tedros urged governments to act swiftly to contain the virus.
"This is not a time for fear," he said. "This is a time for taking action to prevent infection and save lives now."
Countries around the world are continuing to ramp up measures to battle the disease's spread.
Many have advised their citizens to avoid all non-essential travel to China and other affected countries, while others have announced screening measures for passengers arriving from places with outbreaks.
Stock markets around the world have fallen sharply amid fears that such increased travel restrictions will prevent business activity.
A number of international conferences and sporting events have also been cancelled, including Six Nations rugby matches with Italy in Dublin that were to be held on 7 and 8 March.
The US has declared the outbreak a public health emergency, the UK has deemed it a "serious and imminent threat" to public health and Japan has closed all its schools.
The WHO declared the crisis a global health emergency on 30 January.
The organisation has confirmed it will not formally "declare" a pandemic for the new coronavirus, though the term may still be used "colloquially".
South Korea, Italy and Iran have all seen significant outbreaks of cases in recent days, with South Korea the worst-affected country after China.
South Korea's biggest virus clusters have been linked to a religious group near the south-eastern city of Daegu, which has a population of around 2.5m.
Meanwhile in Italy, the country's authorities have announced a series of measures to try to halt the virus's spread. It is not yet clear how it entered the country.
Eleven towns in northern Italy at the centre of the outbreak - home to a total of 55,000 people - have been quarantined. Schools, universities and cinemas have been closed and several public events cancelled.
The UK has advised against travelling to the region.
Several countries including Algeria, Denmark, Romania and Spain have reported infections linked to Italy.
Iran confirmed it has seen a number of cases of the virus, most of them in the holy city of Qom, south of Tehran.
Iranian officials have asked people not to go to Qom, but have not shut a shrine in the city that attracts millions of Shia pilgrims each year.
The government also said it had no plans to quarantine any cities and towns. despite fears of a regional epidemic.
Note: Map based on Iran's Ministry of Health figures, given on state TV, which may differ from WHO numbers
Iran has been the source of dozens of cases in neighbouring countries, including Afghanistan, Bahrain, Iraq, Kuwait, Oman and Pakistan.
In response, many of Iran's neighbours have announced the temporary closure of their borders with the country.
Saudi Arabia has also temporarily banned pilgrims from entering the country to visit the holy sites of Mecca and Medina and suspended visas for tourists from countries with confirmed cases of the virus.
The number of overall coronavirus cases in China has been rising since January.
The country accounts for almost 79,000 of the global 83,000 cases - and thousands more Chinese citizens are under medical observation.
Government and regional officials have introduced a number of tight restrictions in a bid to reduce infections, including cancelling flights, closing schools and workplaces and ordering some cities to go into lockdown.
Authorities also postponed the country's annual parliamentary gathering - the National People's Congress.
Hubei province - the centre of the outbreak - remains the worst affected, seeing by far the biggest number of cases of the virus.
Its capital city of Wuhan, home to 11 million people, has been under lockdown since 23 January, with transport links into and out of the city closed.
The origins of the new coronavirus have been linked to illegally traded wildlife at Wuhan's seafood market, which sells live animals including bats, rabbits and marmots. However, the exact source of the outbreak has not been identified.
Hundreds of foreign nationals have been evacuated from Wuhan by several governments including the US, France and Britain.
New cases announced in China have remained low over recent days, compared with numbers seen in early-mid February, according to official figures.
Figures have stayed in the hundreds rather than the thousands for the last week, following a spike in mid-February.
Officials in Hubei province have come under fire for their handling of the virus outbreak, including causing confusion by changing the criteria used to count the number of cases.
Changes to the way patients were diagnosed half way through February caused a brief spike in the number of confirmed cases, but this change was later reversed, causing a later dip.
The number of deaths announced each day by the Chinese authorities have been dropping for most of the last few days. Like the daily confirmed cases, daily death figures saw a spike caused by the change in diagnosis criteria in mid-February.
Wuhan continues to account for the majority of new cases and deaths in China.
Despite the drop in deaths, the new coronavirus has overtaken the 2003 Sars epidemic in both confirmed cases and deaths.
The Sars - severe acute respiratory syndrome - outbreak lasted around eight months and killed 774 people out of around 8,100 confirmed cases.
A study of 44,000 coronavirus cases by the Chinese Centre for Disease Control and Prevention found that more than 80% had been mild, with the sick and elderly most at risk, while 4.7% had been critical.
A report on the early stages of the outbreak by the Lancet medical journal said most patients who died from the virus had had pre-existing conditions.
Medical researchers and scientists say it is too early to accurately predict how the virus will spread or calculate the death rate, partly due to mild cases remaining untested and unrecorded and a time lag of reporting infections.
As there is not yet a specific anti-viral treatment for coronavirus, people with the infection are currently being treated for their symptoms.
