omicron variant displaces delta. emergence of new dangerous strain of coronavirus covid-19 omicron. words vaccine on colored red

529 617 africa artificial awareness b11529 b16171 biology chimeric concept conceptual concern copy corona coronavirus covid19 dangerous delta disease doctors emergence immunity infection injection medical medicine microbiology motion mutation new omicron pandemic particular phonendoscope red sarscov2 scientists shot solution south space spreading stop strain vaccination vaccine variant virus