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Variant of covid 19 virus, omicron BA. 2, drawn on a blackboard with chalk
Travel safely on public transport. Young woman with KN95 FFP2 face mask looking through train window. Train passenger with protective mask travels sitting in business class looking through the window.
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Omicron variant of covid 19 testing. Coronavirus test in hospital laboratory. Doctor analyzing patient blood and nasal swab sample for new covid-19 mutation. Pandemic prevention. Clinical research.
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