covid19 means 2019 new coronavirus. 2019-nCoV, named by WHO in January 2020, SARS-CoV-2, named by the International Committee on Taxonomy of Viruses on February 11, 2020.

Origin of the virus:

On January 15, 2021, a variant of the new coronavirus from Brazil was discovered in the United Kingdom. On February 21, according to Russia Today, as many as 240 new variants of the new coronavirus strain were discovered across India. On March 30, the China-WHO joint research report on the origin of the new coronavirus was released in Geneva. The report showed that the South China Seafood Market in Wuhan was not the original source of the new coronavirus.

Mutated strain:

Reported on November 24, 2021, scientists recently issued a warning that a new coronavirus mutant strain carrying an "extremely large number of" mutations "quietly emerged" , at a time when the epidemic situation in many countries is "peaking again", the emergence of such a new mutant strain may "make matters worse".

Ravi Gupta, professor of clinical microbiology at the University of Cambridge, said that the two mutations on B.1.1.529 increase the infectivity and reduce the ability of antibody recognition. Judging from the current mutations, this is indeed an issue worthy of concern.

However, he said that a key characteristic of this virus is still unclear, and that is its infectivity, because this is the key reason why the Delta variant dominates. "Immune escape is only possible. part of the situation".

Reference for the above content: Baidu Encyclopedia - 2019 Novel Coronavirus