The first known cases of covid involved mainly workers in the Wuhan, China wet market, where fish and other animals, including live ones, were sold. In the first weeks of January 2020, scientists identified strange pneumonia in these subjects caused by a new coronavirus, designated SARS-CoV-2. The first report attributable to the new virus occurred on 31 December 2019, but already on 8 December the first patients with symptomatic disease appeared. On 1 January 2020, the authorities ordered the closure of the market and the isolation of those who showed signs and symptoms of the infection. The first confirmed death dates back to 9 January 2020. As of 28 January 2020 there were more than 4 600 confirmed cases of contagion in many countries of the world and 106 deaths, while on 15 February these figures had already risen to 49 053 cases and 1 381 deaths.

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