A group of scientists from the Institute for the Study of Biodiversity (IRBio) of the University of Barcelona in their phylogenetic study concluded that coronavirus appeared at least in October 2019 in Wuhan. About this writes Frontiersin.
In a new study, scientists write that during the appearance of coronavirus in October 2019, the virus spread almost without symptoms, without causing an epidemic.
Three conditions are necessary for the spread of an infectious disease, scientists write – the pathogen must be able to infect and multiply in humans, there must be contact between people and the reservoir of the pathogen, and finally it must spread in a densely populated area. Moreover, all the factors necessary for the development of COVID-19 were in this area of China at the end of 2019.
Researchers note that the development of coronavirus infection occurred due to an accidental coincidence of biological and social factors – the virus appeared in this area at the end of the year, before the Chinese New Year, when infected people began to massively leave for other regions.
At the same time, scientists note that the epidemic of COVID-19 has a large number of similar factors with previous epidemics of coronaviruses. Accordingly, in the future there will be other large pandemics of coronavirus infections, as there are thousands of such viruses.
However, the first case of coronavirus infection in France was discovered in December 2019. On December 27, tests were performed on a patient with pneumonia in the suburbs of Paris, which a few months later were tested for COVID-19, and it turned out that the test result was positive.