Coronavirus: South Korea sees its largest rise in coronavirus cases

South Korea has recorded its largest increase in coronavirus infections in a single day, with 594 new cases confirmed on Friday.

This brings the number of infections in South Korea to 2,931. Seventeen people have died in the country so far.

South Korea has the highest number of confirmed cases outside China, where the outbreak started.

The army has been mobilised in the worst-hit region. Soldiers are disinfecting large parts of the city.

Separately, there has been concern over a number of new cases of unknown origin in the US states of California and Oregon.

What's happening in South Korea?

Most of the new cases of the Covid-19 respiratory disease were in Daegu, the south-eastern city that has been at the centre of the country's outbreak.

The spread of the virus in South Korea has been linked to the fringe Christian group Shincheonji Church. Authorities believe members infected one another during services in Daegu and then fanned out around the country, apparently undetected.

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South Korean health officials believe that a 61-year-old member of the sect who last week tested positive for the virus was among the first to be infected and is now at the centre of their investigation.

The female patient initially refused to be transferred to a hospital to be tested and is known to have attended several church gatherings before testing positive.

Any large gathering in a confined space she would have attended - like a church service - is likely to have led to further infections, health officials say.

The church says it is being unfairly targeted for criticism and has complained of a witch-hunt.

In neighbouring North Korea, meanwhile, leader Kim Jong-un has warned of "serious consequences" if his officials fail to prevent an outbreak in the country.

Why are the new US cases of concern?

Authorities in the US are now dealing with three patients who contracted the virus despite not having travelled to an affected area or had contact with a known case.

Two of the infections were reported on Friday - one in California and one in Oregon. Another such case had been detected in California on Tuesday. A total of 59 coronavirus cases have been confirmed in the US, according to the World Health Organization (WHO).

California and Oregon are not the first areas to report coronavirus cases of unclear origin. Earlier this week a patient who had no known connection with an affected region died in France.

On Friday, a patient diagnosed with the virus in England was said to be the first to catch it in the UK.

Separately, the US government has also delayed a special summit of the Association of Southeast Asian Nations (Asean), which was due to take place in March in Las Vegas.

The latest developments came as the WHO on Friday upgraded the global risk of the outbreak to its highest level .

But the UN body said there was still a chance of containing the virus if its chain of transmission were broken.

WHO head Dr Tedros Adhanom Ghebreyesus also stressed that fear and misinformation were the biggest challenges to overcome.

What other developments have there been?

More than 50 countries have now reported cases of coronavirus.
More than 83,650 cases of coronavirus have been confirmed globally, the vast majority of them in China, where 78,961 people have been infected and 2,791 have died.
Belarus, Lithuania, Netherlands, New Zealand, and Nigeria all reported their first cases
The first British death from Covid-19 was announced - a passenger on the Diamond Princess cruise ship docked in Japan
Fear about the virus has continued to hit global markets. Shares have shed almost 13% of their value this week on London's FTSE , wiping £210bn ($267bn) from the value of companies on the index
Sources within Iran's healthcare system told BBC Persian that, as of Thursday evening, at least 210 people had died from the virus. This is more than six times higher than the official government figure.