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China alerted WHO to several cases of unusual pneumonia in Wuhan, a port city of 11 million people in the central Hubei province. The virus was unknown.
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Officials announced they had identified a new virus, according to the WHO. The novel virus was named 2019-nCoV and was identified as belonging to the coronavirus family, which includes SARS and the common cold.
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China reported a third death and more than 200 infections, with cases also reported outside Hubei province including in the capital Beijing, Shanghai and Shenzhen.
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The death toll in China rose to 106, with 100 in Hubei province, authorities reported. Another 4,515 people in China were reported to be infected. There were 2,714 confirmed cases in Hubei province, up from 1,423 the day before.
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The number of confirmed cases in China jumped to 9,809. Russia, Spain, Sweden and the United Kingdom confirmed their first cases of the virus.
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More flights evacuating US citizens returned from Wuhan and the WHO reaffirmed there was "no known effective treatment" for the coronavirus.
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Li Wenliang, a doctor who was among the first to sound the alarm over the coronavirus, died, and Hong Kong introduced prison sentences for anyone breaching quarantine rules.
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the coronavirus had killed nearly 3,500 people and infected another 102,000 people across more than 90 countries.
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Spain reported about 2,000 new coronavirus cases and more than 100 deaths over the last 24 hours. The new figures raise Spain's COVID-19 death toll to 288, with more than 7,700 people infected.
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The world marked two grim milestones as the global total of confirmed COVID-19 cases surpassed 1 million and the worldwide death toll from the disease topped 50,000.