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The timeline of the COVID-19 pandemic lists the articles containing the chronology and epidemiology of SARS-CoV-2, [1] the virus that causes the coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. [2]
By 18 April 2020, there had been 7 confirmed cases in the country, 6 of whom recovered, and one died making Mauritania at the time the only affected country in Africa and in the world to become free of COVID-19. [95] A further case was confirmed on 29 April. [96] [non-primary source needed]
A COVID-19 vaccine is intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2), the virus that causes coronavirus disease 2019 . Prior to the COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute ...
The COVID‑19 vaccines are widely credited for their role in reducing the spread of COVID‑19 and reducing the severity and death caused by COVID‑19. [ 211 ] [ 217 ] According to a June 2022 study, COVID‑19 vaccines prevented an additional 14.4 to 19.8 million deaths in 185 countries and territories from 8 December 2020 to 8 December 2021 ...
Transcription of the interrupted repeats was also noted for the first time; this was the first full characterization of CRISPR. [19] [20] By 2000, Mojica and his students, after an automated search of published genomes, identified interrupted repeats in 20 species of microbes as belonging to the same family. [21]
The history of coronaviruses is an account of the discovery of the diseases caused by coronaviruses and the diseases they cause. It starts with the first report of a new type of upper-respiratory tract disease among chickens in North Dakota, U.S., in 1931.
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On 10 June, the WHO reported that research was continuing to determine how the COVID-19 virus can be transmitted by people who show no symptoms of the disease (asymptomatic transmission). [101] On 11 June, the WHO Africa regional office warned that COVID-19 was accelerating in Africa, with more than 200,000 cases and more than 5,600 deaths. [102]