A group of scientists from the United States, Britain and Australia suggests the theory of the appearance of the coronavirus COVID-19. They believe that this virus has always been, it has been in the human body for many years. And then something happened and this virus began to kill people. Before it became a threat to all of humanity, he was among people for a long time but was not noticed by doctors.
Microbiologists were able to analyze the gene structure of the SARS-CoV-2 virus. They also conducted a gene analysis of several other similar coronaviruses. The analysis results showed that sections of the receptor-binding domain (RBD) of spike SARS-CoV-2 proteins efficiently bind to human cells.
But this phenomenon could happen after a long evolutionary preparation, which took place only inside the human body. This was told by immunologist Scripps Research Christian Andersen.
She believes that the virus has two features in its mutation. But most importantly - COVID-19 was not created in the laboratory, it is excluded. He could only appear in nature. The same viruses are in bats, they have a similar genome, but they do not completely match.
Scientists believe that this is a picture of a change in the virus inside the human body. The change in the genomic structure of the viral strain led to the fact that coronavirus began to harm people and even began to kill people. It took decades. Now coronavirus has acquired the ability to be transmitted from person to person and cause a deadly disease.