【Explanation】 Recently, the rebound of the epidemic in Harbin is likely to be the focus of the masses for the source of the spread chain.
[Commentary] On April 28, the Heilongjiang Provincial Government Information Office organized a press conference and invited Professor Zhang Xue, an academician of the Chinese Academy of Engineering, to interpret the matter.
[Same period] Zhang Xue, academician of Chinese Academy of Engineering
We now analyze the data of 21 genomes, determine a source, and then judge based on its genotype, the input cases are from foreign countries. We analyzed this sequence from a professional perspective, and clearly saw that the sequence of our viral genome is obviously different from that of our Chinese.
[Commentary] According to Professor Zhang Xue, the Heilongjiang CDC sent the whole-genome sequence data of 21 people collected on April 15 to the CDC in two batches, which were handed over to experts from the CDC analysis.
[Same period] Zhang Xue, academician of Chinese Academy of Engineering
The analysis results of experts from the Chinese Center for Disease Control and Biomedical Information of Harbin Medical University are highly consistent. In layman's terms, the sequences of these genomes are more than 99.99%. Among them, the genomes of 18 people are exactly the same. The other three are 1-2 nucleotides, which is almost negligible, which means that all these people It was handed down from one person.
[Commentary] At the press conference, Professor Zhang Xue answered the question that Han had eaten with his family after finishing his home isolation in Harbin, and had also traveled to Shanghai for surgery, but so far has not caused infections to other related personnel.
[Same period] Zhang Xue, academician of Chinese Academy of Engineering
When she (Han) released the isolation, her nucleic acid was tested negative for several times, but she had two positive IgGs, proving that specific antibodies were already available. At this stage, the virus can no longer be said to have disappeared. Generally speaking, it has been defeated, so the chance of infection and infection is obviously or greatly reduced.
Reporter Liu Bingxin reports from Harbin, Heilongjiang
Editor in charge: [Fang Jialiang]