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According to Google:
Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus.
Most people who fall sick with COVID-19 will experience mild to moderate symptoms and recover without special treatment. However, some will become seriously ill and require medical attention.
From Wikipedia:
Omicron variant and other major or previous variants of concern of SARS-CoV-2 depicted in a tree scaled radially by genetic distance, derived from Nextstrain on 1 December 2021
Referenced within the video:
Well since you noticed The plague i dont know if you have read about The Gene mutation (?) in CCR5 wich is a deletion of it and its called CCR5-delta 32 wich make homozygot People to be resistant to Hiv. The theory is about The survivors after The plague had this copy and then that its also beneficial to other viruses. Its highest in nordic countries. Ive always wondered if this could have a connection to rh-.