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when did covid start?

The COVID-19 pandemic has its origins traced back to late 2019. Here are the key dates:

  • The first cases of COVID-19 are believed to have appeared on a small scale in November 2019, with the first large cluster of cases emerging in December 2019 in Wuhan, China245.
  • By 26 December 2019, a pneumonia cluster was observed in Wuhan, and by 31 December 2019, the Wuhan Municipal Health Commission had reported 27 cases of pneumonia of unknown cause1.
  • The World Health Organization (WHO) was notified about the cluster of unknown pneumonia cases on 31 December 20191.

The global spread and declaration of the pandemic followed in early 2020, with the WHO declaring it a Public Health Emergency of International Concern (PHEIC) on 30 January 2020, and later characterizing it as a pandemic on 11 March 2020145.

Sources:

1 en.wikipedia.org en.wikipedia.org 2 www.webmd.com www.webmd.com 3 www.nm.org www.nm.org 4 www.yalemedicine.org www.yalemedicine.org 5 www.who.int www.who.int

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