Coronaviruses (CoV) are a large family of viruses that cause illness ranging from the common cold to more severe diseases. The COVID-19 epidemic was declared by the WHO as a public health emergency of international concern on January 30, 2020. The Director-General of the World Health Organization (WHO), Dr. Tedros Adhanom Ghebreyesus, announced on 11 March 2020 that the new coronavirus disease 2019 (COVID-19) can be characterized as a pandemic. Describing the situation as a pandemic means that the epidemic has spread to several countries, continents or throughout the world, and that it affects large numbers of people.
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