Delta, a mutant of COVID-19? . It was first discovered in India in June 2020? . In May, 20021,WHO named it COVID-19 mutant B. 1.6 17.2, which was first discovered in India. This mutation was identified as one of the driving factors of the second wave of epidemic in India.
On June 5th, 20021,it was reported that the "Delta" variant was further mutated into "Delta+" or "AY. 1" variant? . On July 2nd, WHO held a regular press conference in COVID-19. WHO Director-General Tan Desai said that in many countries, Delta mutant is becoming the main epidemic strain. Delta variants have appeared in at least 98 countries and regions, and continue to mutate and evolve. ?
Now in the United States, Delta mutates faster and is even immune to vaccines. Next, let's take a look at how Delta has mutated in the United States.
2021June 19 According to the Wall Street Journal, delta virus infection accounts for 9.9% of COVID-19 cases reported in the United States. ?
In June, 20021year, according to the data of the US Centers for Disease Control and Prevention, the number of cases infected with "Delta" variant accounted for 10% of the total number of newly diagnosed cases in the United States, and it is becoming the mainstream strain in the United States. ?
On June 22nd, 20021,Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said that the mutated COVID-19 Delta strain was the biggest threat to eliminate the COVID-19 epidemic in the United States. The US Centers for Disease Control and Prevention released a report saying that more than 20% of the new cases of COVID-19 infection in the United States in the last two weeks were infected with Delta strain, while in the report released on the 8th, the figure was only about 6%. ?
On June 27th, 20021,gottlieb, former director of the US Food and Drug Administration, told CBS that with the rapid spread of Delta mutant strains, "a very dense epidemic situation" may occur in some parts of the United States. At present, there are cases of delta variant virus infection in 49 States and Washington, DC.
On June 29th, 2002 1 year, the US Centers for Disease Control and Prevention said that1case was infected with Delta strain in every five confirmed cases in COVID-19.
In July, 20021,the director of the centers for disease control and prevention in the United States, Valensky, said that Delta strain could easily lead to "super-transmission". Virus gene sequencing shows that nearly 50% of the sequenced viruses in some parts of the United States are Delta strains. The US Centers for Disease Control and Prevention predicts that in the next two weeks, the number of infections caused by Delta mutant strains will reach 26. 1% of the total number of new cases in the United States.
In July, 20021year, according to American media reports, Delta virus infection cases have covered all 50 states and Washington, D.C. ...
On July 20th, 20021,the director of the Centers for Disease Control and Prevention (CDC) in the United States, Valensky said that 83% of newly confirmed cases in the United States were infected with Delta mutant virus, a sharp increase from 50% at the beginning of July. ?
On July 23rd, 2002/kloc-0, American consumer news and business channel reported that with the rapid spread of Delta mutant in the United States, COVID-19 cases in 50 states and the District of Columbia in the United States were on the rise. According to Johns Hopkins University, in the past week, about 43,700 new cases were reported every day in the United States, an increase of 65%, almost three times that of two weeks ago. ?
However, just yesterday, China began to report on this. On the 29th, the American media disclosed that the report of the Centers for Disease Control and Prevention (CDC) pointed out that Delta COVID-19 mutant virus is as contagious as chickenpox, and its ability to break through the protection of COVID-19 vaccine is stronger, so people who have been vaccinated may still be infected and infect others.
The briefing pointed out that the CDC's next action is based on "acknowledging that the epidemic prevention war has changed". Valensky, director of the CDC, said that new research shows that people who have been vaccinated will carry a lot of viruses in their nasal cavity and throat after being infected with Delta mutant virus, so they are advised to wear masks again to avoid spreading the virus.
According to CDC documents, Delta's infectivity has surpassed that of MERS, SARS and other viruses, and it is as high as chicken pox, and each patient can infect 8 to 9 people on average. In addition, people who have been vaccinated will produce the same amount of virus after being infected with Delta variant, and the infectivity is almost the same as that of those who have not been vaccinated.
The document predicts that among the 654.38+62 billion vaccinators in the United States, 35,000 people will develop infection symptoms every week. "Despite vaccination, there will still be more breakthrough infections and community transmission."
Next, let's discuss how to treat the serious spread of Delta mutant virus.
On the one hand, it shows that the epidemic prevention in the United States is not strong enough, and the country does not pay enough attention to the epidemic situation. Before, there were not enough medical supplies in the United States, and medical staff cried on ins YouTube that there were not enough supplies and medical staff could not protect them. This is well known at home and abroad.
On the other hand, it shows the maturity and rapid development of mutant virus. In addition, the vaccine in COVID-19 lags behind the mutated virus, and it has not been updated in time, or has not invested funds and energy in research. Only the media has been guiding public opinion. I'm afraid the situation in America is even worse. Now the World Health Organization has stood up and started to discuss the research of new vaccines. Xiaoqi said: I hope all countries will seize the opportunity to develop a vaccine as soon as possible.
World Health Organization: Production of the second generation vaccine. The so-called second-generation vaccine is to produce a vaccine that can deal with various mutant strains, without worrying about virus immune escape, but this research route is complicated and the time of successful research and development is uncertain.
Production of improved vaccines. It is mainly to add or replace the old vaccine into a new mutant virus strain and its gene sequence, that is, the existing vaccine. After these vaccines are developed, they can be continuously inoculated with existing vaccines, and can also be used in combination with new and improved vaccines and vaccines of different strains for enhanced immunization, including re-inoculation.