What are XE mutants?XE is a mutant resulting from recombination of BA.1 (original Omicron strain) and BA.2 (Omicron "stealth" strain), and is referred to as a "recombinant" or hybrid strain. And a "variant" is a version of a virus that contains a set of mutations, or changes in its genetic material.

Antigen rapid test: how to face COVID-19 with a positive attitude? In fact, the epidemic not only threatens our physical health, but also shrouds our psychology in anxiety. So, how to alleviate anxiety?