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Assessment on COVID-19 Origins [1] is a 2021 United States intelligence report, which was commissioned on May 26, 2021 by President Joe Biden and declassified in August of the same year. Biden initially ordered his intelligence services to "redouble efforts" concerning the origins of the SARS-CoV-2 virus. [ 2 ]
SARS-CoV-2, the causative agent of COVID-19, was first introduced to humans through zoonosis (transmission of a pathogen to a human from an animal), and a zoonotic spillover event is the origin of SARS-CoV-2 that is considered most plausible by the scientific community.
On 26 May 2021, President Joe Biden directed the U.S. intelligence community to produce a report within 90 days on whether the COVID-19 virus originated from human contact with an infected animal or from an accidental lab leak, [79] stating his national security staff said there is insufficient evidence to determine either hypothesis to be more ...
The COVID-19 XEC variant is derived from Omicron strains KS.1.1 and KP.3.3, says Dr. Francesca Torriani, MD, an infectious disease specialist with UC San Diego Health. XEC was first detected in ...
Coronavirus diseases are caused by viruses in the coronavirus subfamily, a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, the group of viruses cause respiratory tract infections that can range from mild to lethal.
Transmission of SARS-CoV-1 and SARS‑CoV‑2 from mammals as biological carriers to humans. No natural reservoir for SARS-CoV-2 has been identified. [79] Prior to the emergence of SARS-CoV-2 as a pathogen infecting humans, there had been two previous zoonosis-based coronavirus epidemics, those caused by SARS-CoV-1 and MERS-CoV. [18]
Biosafety level 4 laboratories are designed for diagnostic work and research on easily respiratory-acquired viruses which can often cause severe and/or fatal disease. What follows is a list of select agents that have specific biocontainment requirements according to US federal law. Organisms include those harmful to human health, or to animal ...
Human coronavirus OC43 [1] (HCoV-OC43) is a member of the species Betacoronavirus 1, which infects humans and cattle. [ 2 ] [ 3 ] The infecting coronavirus is an enveloped , positive-sense , single-stranded RNA virus that enters its host cell by binding to the N-acetyl-9-O-acetylneuraminic acid receptor . [ 4 ]