According to Fox News, on the 21st local time, US President Biden, who tested positive for covid-19, posted a video on his social media to report that he was safe.
Biden said in the video that he felt good and had mild symptoms. He said that he had received two doses of vaccine and two booster injections, and his symptoms were very mild.
According to US media reports, Biden's wife Jill Biden tested negative for novel coronavirus.
Since the beginning of this year, many senior officials such as US Vice President Harris, speaker of the house of Representatives Pelosi and US Secretary of State Antony Blinken have been infected with novel coronavirus. A month ago, Fauci, the chief medical adviser of the White House, also tested positive for covid-19.
The number of covid-19 deaths in the United States exceeded 1.02 million
The latest statistics of COVID-19 released by Johns Hopkins University in the United States on the 21st showed that there were more than 90million confirmed cases in the United States.
As of 14:20 on the 21st, the cumulative number of confirmed cases in the United States has reached 90089982, and the cumulative number of deaths has reached 1025898. The United States has the largest number of confirmed cases and deaths in the world.
About 85% of Americans live in high-risk areas of the epidemic
On July 17, ABC reported that at present, 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.
New subtypes ba.4 and ba Recently, the spread has accelerated in the United States, resulting in a rebound in the epidemic. According to the CDC data, as of July 16, the ba.5 subtype has accounted for 75.8-79.9% of new infections.
What is the origin of the Omicron ba.4 and ba.5 strains that triggered the global epidemic?
As subtype mutants of novel coronavirus Omicron, ba.4 and ba.5 strains share the same origin with early Omicron strains, but are easier to spread and escape immunity.
According to nature, ba.4 and ba.5 strains are 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
Fauci, director of the National Institute of allergy and infectious diseases, 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.