Omicron has mutated again!Several cases have been reported in neighboring countries, with an increase of nearly 20%

Since the outbreak of COVID-19, it has rapidly spread around the world.In November, there appeared to be a “lull” in the global outbreak as the Delta strain slowly receded.Within a month, however, South Africa reported the discovery of an entirely new mutant strain of omicron.Subsequently, the virus spread rapidly in the United States and The United Kingdom. The number of new cases in the United States in a single day set a global record, exceeding one million. The Who also once assessed the risk of the virus as “very high”.A variant of the omicron subtype strain (BA.2) has been identified by British health authorities as the “sister of omicron”, according to reference News.Ba.2 has a lot in common with omicron, but it spreads faster and more time is needed to understand the strain.Ba.2 is missing a key mutation that makes it difficult for health officials to detect cases of infection, even after multiple nucleic acid tests, making the risk of transmission even greater, experts said.However, the omicron subtype has also recently emerged in Japan, where at least 20 people have been infected.Japanese medical authorities said there are still many things scientists do not know about the virus, but it is nearly 20% faster than the traditional omicron infection, and called on the Japanese people to strengthen the awareness of the epidemic prevention and control.Compared with the mainstream omicron strain BA.1, the mutation site of BA.2 is different.The U.K. ‘s Department of Health said earlier that ba.2 had appeared in more than 40 countries since December.The number of BA.2 infections in Denmark accounts for half of the increasing cases.The World Health Organization has stressed the need to step up research and investigations into the virus.So far, 27 cases of BA.2 infection have been reported in Japan.Tetsuya Matsumoto, a professor at the University of Welfare in Japan, said that the current symptoms of BA.2 patients are no different from that of BA.1, but the infectiousness is much higher than that of the latter, so it is difficult to guarantee Japan’s epidemic prevention and control in the future.It is worth mentioning that when Omicron first appeared last year, the Japanese government announced a border closure, barring people from South Africa and other countries from entering Japan, but this measure did not include American troops stationed in Japan.Subsequently, the epidemic in Japan rebounded on a large scale, and many Japanese people believed that the US army stationed in Japan spread the virus into Japan.As of now, the cumulative number of confirmed cases in Japan has exceeded 2.438 million, and the number of new cases in Japan hit a new high of 70,000 on Monday.

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