As COVID-19 variants Delta and Omicron which are highly transmissible, are raging across the globe, the World Health Organization (WHO) on Wednesday warned that they have posed "twin threats", driving up the number of infections.
As COVID-19 variants Delta and Omicron which are highly transmissible, are raging across the globe, the World Health Organization (WHO) on Wednesday warned that they have posed "twin threats", driving up the number of infections.
