Several countries are banning air travel from Britain because of rising concerns over a mutant strain of the coronavirus.

由于对新冠病毒变异菌株的担忧日益加剧，一些国家禁止来自英国的航班。

Gao says the new vaccine can produce neutralizing antibodies for mutant COVID-19 strains found in South Africa, Britain and Brazil.

高福表示，新疫苗可以对南非、英国和巴西发现的新冠病毒变异毒株产生中和抗体。

This is all due to a mutant strain of the coronavirus that has rapidly spread through London and southern England in December.

这都是由于新冠病毒变异菌株于十二月在伦敦和英国南部迅速传播。

British scientists have been scrambling to work out whether the mutant strain may be resistant to the crop of newly developed vaccines.

英国科学家一直在努力研究新冠病毒变异菌株是否对新开发的疫苗具有耐药性。

They were studying two mutant strains of worms that had defects in the genes that dictated how the animals developed and worked.

他们正在研究两种突变的蠕虫菌株，这些菌株在决定动物发育和工作方式的基因上存在缺陷。