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Zoonotic diseases generally refer to diseases of animal origin in which direct or vector mediated animal-to-human transmission is the usual source of human infection. Animal populations are the principal reservoir of the pathogen and horizontal infection in humans is rare.
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.
Severe acute respiratory syndrome (SARS) is a viral respiratory disease of zoonotic origin caused by the virus SARS-CoV-1, the first identified strain of the SARS-related coronavirus. [3] The first known cases occurred in November 2002, and the syndrome caused the 2002–2004 SARS outbreak .
Four other agencies have expressed “low confidence” in a zoonotic origin, meaning that they believe the coronavirus came from a wildlife market but lack the evidence to make a more definitive ...
The researchers weren't able to tell whether those viruses were shed by animals or people, but the lineage A sample came from a stall where a worker sought medical attention in mid-December 2019.
Former White House coronavirus advisor Anthony Fauci doesn't believe the lab leak explanation of COVID-19's origins is a conspiracy theory. He admitted as much during a closed-door grilling ...
Measles is of zoonotic origin, having evolved from rinderpest, which infects cattle. [166] A precursor of the measles began causing infections in humans as early as the 4th century BC [ 167 ] [ 168 ] or as late as after 500 AD. [ 166 ]
SARS-CoV-2 is of zoonotic origin; its close genetic similarity to bat coronaviruses suggests it emerged from such a bat-borne virus. [18] Research is ongoing as to whether SARS‑CoV‑2 came directly from bats or indirectly through any intermediate hosts. [19]