The global coronavirus disease 2019(COVID-19)pandemic has caused more than 6.1 million deaths until March 24,2022,as reported by the World Health Organization(WHO).Recently,breakthrough infections have appeared in ind...The global coronavirus disease 2019(COVID-19)pandemic has caused more than 6.1 million deaths until March 24,2022,as reported by the World Health Organization(WHO).Recently,breakthrough infections have appeared in individuals fully vaccinated against SARS-Co V-2^(1),which could be attributed to the rapid mutation of the RNA virus2.Currently,following the Delta variant,the Omicron variant of SARS-Co V-2 is increasingly becoming the dominant epidemic strain in the world.展开更多
文摘The global coronavirus disease 2019(COVID-19)pandemic has caused more than 6.1 million deaths until March 24,2022,as reported by the World Health Organization(WHO).Recently,breakthrough infections have appeared in individuals fully vaccinated against SARS-Co V-2^(1),which could be attributed to the rapid mutation of the RNA virus2.Currently,following the Delta variant,the Omicron variant of SARS-Co V-2 is increasingly becoming the dominant epidemic strain in the world.
