Why Omicron strains still a global concern
Since its discovery six months ago, Omicron has been producing subvariants faster than scientists can name them. Omicron BA.4, BA.5 and BA.2.12.1 recently became the dominant strains in countries including South Africa, Portugal and the United States. In May, they reached China. But how quickly are these new strains transmitted? How do they compare to previous strains in terms of severity? Will vaccines work against them? And what does the emergence of new subvariants mean to our fight against the pandemic?
Source: chinadaily.com.cn
