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The highly transmissible BA.5 omicron subvariant is now the dominant coronavirus strain in the U.S., accounting for nearly 54% of Covid-19 infections last week, according to ការប៉ាន់ប្រមាណ from the Centers for Disease Control and Prevention, as cases rise and drug companies work to reformulate vaccines to target new virus strains known for their ability to evade antibodies.
A nurse tends to a Covid-19 patient in the Intensive Care Unit.
AFP តាមរយៈគេហទំព័រ Getty Images
ការពិតសំខាន់
BA.5 and the closely related omicron substrain BA.4 comprised 70% of coronavirus infections for the week ending July 2, according to CDC estimates, which may be subject to changes.
The BA.2.12.1 variant, which helped fuel a spike in Covid-19 cases when it was dominant in the spring, accounted for only 27% of cases last week.
The news comes a week after the Food and Drug Administration recommended that pharmaceutical companies ធ្វើឱ្យទាន់សម័យ their coronavirus vaccine booster shots by the fall to target BA.4 and BA.5, in anticipation of a winter Covid-19 surge.
It also comes as Covid-19 ករណី have been on the rise in recent months, with the United States averaging 94,345 new infections per day in the week ending July 4, more than triple the 30,558 daily cases reported as of April 10, but well below the January peak of more than 800,000 per day.
មន្ទីរពេទ្យ have trended upwards, too: Covid-19 hospital admissions averaged 4,376 per day in the seven-day period ending July 3, more than twice the average of 1,428 per day in early April, though numbers are still much lower than during the winter coronavirus surge, when daily hospitalizations topped 20,000.
ហេតុការណ៍គួរឱ្យភ្ញាក់ផ្អើល
Over 16% of U.S. coronavirus tests came back positive on average last week, the highest positivity rate since early February, according to the CDC បាន.
សាវតាសំខាន់
BA.4 and BA.5 were first discovered earlier this year in South Africa, where the strains became dominant, and they eventually made their way into the U.S. in late March, though omicron substrain BA.2 remained the dominant variant for several weeks. All three of the substrains have specific mutations in their spike proteins—the part of the virus that binds to the human cell—that help them evade the immune system, with data suggesting BA.5 is even better at escaping antibodies from previous coronavirus infections and vaccines. Countries around the world like the ចក្រភពអង់គ្លេស are also seeing a spike in cases as BA.4 and BA.5 become their most prevalent coronavirus strains. BA.4 and BA.5 combined became the លេចធ្លោ Covid-19 substrains in the U.S. two weeks ago, accounting for 55% of cases.
អ្វីដែលត្រូវមើល
A continued spike in Covid-19 cases over the summer. The rise in new subvariants that are even more contagious than previous strains and capable of escaping the immune system suggest “substantial circulation of virus this summer,” Dan Barouch, director of the Center for Virology and Vaccine Research at Boston’s Beth Israel Deaconess Medical Center, បានប្រាប់ នៃ កាសែត Wall Street Journal សប្ដាហ៍មុន។
អានបន្ថែម
FDA បានផ្តល់អនុសាសន៍ដល់ Covid Boosters កំណត់គោលដៅ Subvariants Omicron ដែលអាចឆ្លងបានខ្ពស់ - នេះជាពេលដែលអ្នកគួរតែបាញ់បន្ទាប់របស់អ្នក (ទស្សនាវដ្តី Forbes)
What to Know About the Newest, Most Contagious Omicron Subvariants (ពេលវេលា)
ការធានារ៉ាប់រងពេញលេញនិងការធ្វើបច្ចុប្បន្នភាពផ្ទាល់លើវីរុសកូរ៉ូណាវ៉ាវី
Source: https://www.forbes.com/sites/madelinehalpert/2022/07/05/highly-contagious-ba5-variant-becomes-dominant-in-us-as-covid-cases-rise/