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https://www.who.int/emergencies/diseases/novel-coronavirus-2019/media-resources/science-in-5/episode-64---why-are-experts-concerned-about-omicron?gclid=Cj0KCQjw5-WRBhCKARIsAAId9Fk6dmDFaSh2kcegYJ3V-d7xeCfiWnNfMWD-E0wHNwrXrm_mD-VbW7MaAruSEALw_wcB