Recently, Omicron subtype ba 4 and ba 5. Another global epidemic climax. Due to the cancellation of epidemic restrictions in many countries and the stronger transmission capacity of the two strains, the number of covid-19 infections in Europe, America, Asia and other countries has increased sharply. Since the outbreak of COVID-19, alpha, beta, Delta and other variants have taken turns to wreak havoc around the world. In the current complex situation of rising vaccination rates and increasingly loose epidemic prevention restrictions, the more "unique" ba 4 and ba Will the 5 strain "sink the world into the quagmire of the epidemic" again? (on July 13 local time, Los Angeles residents wore masks to take the subway.) They are the "culprits" of the rebound of the epidemic? At present, Omicron subtype ba 4 and ba Accelerate the spread, so that the global epidemic, especially in Europe and the United States, has a "rise" trend. According to the data of the World Health Organization on the 12th, the number of covid-19 cases reported globally increased by 30% in the previous two weeks. At present, Omicron ba 5 strain is dominating the epidemic in the United States. A total of 2421 counties in the United States are classified as high-risk areas by the Centers for Disease Control and prevention, and about 85% of Americans live in these areas. Under the strong influence of this epidemic, the US government extended the covid-19 public health emergency for another three months in the middle of this month. BA. The 5 strain has also accelerated its spread in the Americas. The Pan American Health Organization recently reported that Ba has been found in at least 22 countries in the region 5 strain, which is expected to become the main epidemic strain in the Americas in the next few weeks. The epidemic in Europe has also deteriorated rapidly due to the outbreak of the Omicron variant. According to data from the office for National Statistics (ONS) on the 15th, about 3.5 million people in the UK were infected with covid-19 in the previous week, an increase of nearly 30% from 2.7 million in the previous week. According to the office for national statistics, this may be the Omicron variant ba 4 and ba 5. In addition, the epidemic situation in many countries in Europe is severe: France has ushered in the seventh wave of epidemic peak due to the outbreak of Omicron mutant, and the number of new confirmed cases per day once exceeded 200000; The number of newly diagnosed cases in Italy has rebounded to nearly 100000. (data picture: in Tokyo, Japan, affected by the COVID-19, a hotel employee showed the media a meal protective cover to maintain a safe social space.) In Asia, the number of new cases in Japan has broken through the 100000 mark for several consecutive days; The number of new infections in India has also reached its highest level in four months. The number of people hospitalized for covid-19 in Australia, an Oceanian country, approached a "record level" on the 20th; The number of covid-19 cases in New Zealand has also increased significantly in the past few weeks, putting great pressure on the country's medical system. The virus is rampant. What will happen next? Omicron Ba, which triggered the global epidemic 4 and ba What is the origin of the 5 strain? As a subtype variant of novel coronavirus Omicron, ba 4 and ba 5 strain has the same origin with the early Omicron strain, but it is easier to spread and escape immunity. According to nature, ba 4 and ba 5 strain is more similar to the previous ba 2 strains, but they all have their own unique mutations, including changes in virus spike proteins called l452r and f486v. Moreover, these mutations may change its ability to lock in host cells and avoid some immune reactions. Since 2022, many countries around the world have successively cancelled epidemic restrictions and corresponding prevention and control measures, which also gave Omicron ba 4 and ba The rapid spread of the 5 strain provided convenience. Some countries have to face a severe epidemic situation: the number of infected people has doubled, the medical system has encountered challenges, and covid-19 convalescent patients have been infected again At present, the epidemic in European countries is heating up again, but the detection work of covid-19 has been reduced synchronously. Who director for Europe Kruger predicted that "the European region will face a challenging autumn and winter". He called on Member States to take immediate action. If they wait until autumn, it will be too late to take action. (on June 15 local time, the National Institute of allergy and infectious diseases issued a statement saying that Fauci, the director of the Institute and the chief medical adviser of the White House, tested positive for covid-19 on the same day. The picture shows Fauci attending a congressional hearing in March 2020.) Fauci, director of the National Institute of allergy and infectious diseases, also urged Americans not to relax their vigilance. He believes that the number of infected people in the United States is obviously underestimated, because many people will not report whether they are infected after home testing. In particular, he warned that there may be a surge in cases in the United States between autumn and winter 2022. Who director general tandesay also expressed concern about this round of epidemic. He said, "I am worried that the continued rise of covid-19 cases will bring pressure to the tense medical system and medical workers, and I am also worried that the death toll is on the rise.". Tandesai said, "the new round of epidemic once again shows that the covid-19 pandemic is far from over." (Xinhua News Agency)