Palestinian Laboratory Medicine Specialist, tests vials of samples for coronavirus at Medical Laboratory, in Gaza city on November 28, 2021. In the past week a heavily mutated Covid variant has been identified, rapidly labelled a "variant of concern" by the World Health Organization and named Omicron. It has been detected in countries including the UK. Palestinian Laboratory Medicine Specialist, tests vials of samples for coronavirus at Medical Laboratory, Gaza city, Gaza Strip, Palestinian Territory - 27 Nov 2021,Image: 645264162, License: Rights-managed, Restrictions: , Model Release: no, Credit line: Profimedia