| 双语新闻 Bilingual News | 双语对照阅读 分级系列阅读 智能辅助阅读 在线英语学习 |
|
| 双语新闻 Bilingual News | 双语对照阅读 分级系列阅读 智能辅助阅读 在线英语学习 |
| [英文] [中文] [双语对照] [双语交替] [] |
| The coronavirus variant that has moved through the UK is now spreading "rapidly" through the US, according to a new study published on Sunday. |
| The more contagious strain is nearly doubling its prevalence among confirmed cases in the US every nine days. |
| The spread of the variant, known as B.1.1.7, has put added pressure on vaccination efforts worldwide. |
| The US Centers for Disease Control and Prevention (CDC) has predicted it could be the predominant strain by March. |
| The report, posted on the preprint server MedRxiv, is a collaboration of several researchers and scientists. It has not yet been peer-reviewed or published in a journal. |
| Case numbers of the new variant are still somewhat small in the US. |
| According to the CDC, Florida leads the country in reported cases of B.1.1.7 with 187 as of Thursday, followed by California with 145. |
| "Our study shows that the US is on a similar trajectory as other countries where B.1.1.7 rapidly became the dominant SARS-CoV-2 variant, requiring immediate and decisive action to minimize Covid-19 morbidity and mortality," the report's authors wrote. |
| This new strain is 35-45% more transmissible than other strains of the virus currently in the US, the report found. |
| When the CDC first warned of the new variant's presence in the US in mid-January, it was present in less than 0.5% of cases. By the end of the month, this figure had jumped to 3.6%, according to the study. |
| The report comes as the United States' winter virus surge passes its peak. Daily cases throughout the country have been falling for about a month, since early January. But the average daily death toll remains extremely high - some 3,000 per day - and hospitals remain under immense pressure. |
| The B.1.1.7 variant, first discovered in Britain, has so far spread to more than 50 countries. |
| As with the original virus, the risk is highest for the elderly and for those with significant underlying health conditions. |
| There has been some suggestion that the strain may be associated with a 30% higher risk of death, but the evidence on this is not strong, and the data is still uncertain. |
| Current vaccines were designed around earlier variants but initial studies have indicated that the Pfizer, Oxford-AstraZeneca and Moderna vaccines will all protect against the B.1.1.7 strain. |
OK阅读网 版权所有(C)2017 | 联系我们