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Epidemiology

During the early stages, the number of cases doubled approximately every seven and a half days. In early and mid-January 2020, the virus spread to other Chinese provinces, helped by the Chinese new year migration. On 20 January, China reported a sharp rise in cases with nearly 140 new patients, including two people in Beijing and one in Shenzhen.By 25 January, the number of laboratory-confirmed cases stood at 2,062, including 2,016 in Mainland China, seven in Thailand, six in Hong Kong, five in Macau, five in Australia, four in Malaysia, four in Singapore, three in France, three in Japan, three in South Korea, three in Taiwan, three in the United States, two in Vietnam, one in Nepal and one in Sweden.^[76]The earliest reported symptoms occurred 1 December 2019, in a person who did not have any exposure to the Huanan Seafood Wholesale Market or to the remaining 40 affected people. Of the following 40 confirmed cases of COVID-19, two-thirds were found to have a link with the market, which also sold live animals.Of cases that began before 1 January 2020, 55% were linked to the market. By 22 January, this figure was reported to have dropped to 8.6%.^[73] Hence, as the number of cases has increased, the significance of the market has lessened

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