Submitted by number1dork t3_120rixo in askscience
Tackit286 t1_jdkabzy wrote
Reply to comment by porkypuha in What happened to the old COVID variants, like Delta? Could they come back? by number1dork
Typically viruses evolve to be more contagious, but less deadly.
Chances are you’ve either had it without realising, or still carrying some immunity from your last infection and/or vaccination.
Viewing a single comment thread. View all comments