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A study of samples collected in Manaus between November 2020 and January 2021, indicated that the Gamma variant is 1.4–2.2 times more transmissible and was shown to be capable of evading 25–61% of inherited immunity from previous coronavirus diseases, leading to the possibility of reinfection after recovery from an earlier COVID-19 ...
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]
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. The causative agent was identified as a virus in 1933.
Widespread non-communicable diseases such as cardiovascular disease and cancer are not included. An epidemic is the rapid spread of disease to a large number of people in a given population within a short period of time; in meningococcal infections , an attack rate in excess of 15 cases per 100,000 people for two consecutive weeks is considered ...
JN.1 is a COVID-19 variant that descended from BA.2.86, explains infectious disease expert Amesh Adalja, M.D., a senior scholar at the Johns Hopkins Center for Health Security. JN.1 is “another ...
The Beta variant, [1] [2] (B.1.351), [a] was [5] [6] a variant of SARS-CoV-2, the virus that causes COVID-19. One of several SARS-CoV-2 variants initially believed to be of particular importance , it was first detected in the Nelson Mandela Bay [ 7 ] metropolitan area of the Eastern Cape province of South Africa in October 2020, [ 8 ] which was ...
Transmission and life-cycle of SARS-CoV-2 causing COVID-19. Coronaviruses vary significantly in risk factor. Some can kill more than 30% of those infected, such as MERS-CoV, and some are relatively harmless, such as the common cold. [49] Coronaviruses can cause colds with major symptoms, such as fever, and a sore throat from swollen adenoids. [91]
WHO reports that given community transmission the number of cases doubles every 1.5 to three days. The variant is now in 89 counties, and its severity profile remains unknown. [126] Seven to ten percent of new confirmed coronavirus cases in France are suspected to be of the Omicron variant and the travel ban on the UK comes into force. [127]
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