What happened to the old COVID variants, like Delta? Could they come back? Submitted by number1dork t3_120rixo on March 24, 2023 at 5:29 PM in askscience 209 comments 3,359
Corvus-Nox t1_jdjpav6 wrote on March 24, 2023 at 9:49 PM Reply to comment by Matrix17 in What happened to the old COVID variants, like Delta? Could they come back? by number1dork In Canada, I believe the guideline is 6 months between boosters or after an infection. Permalink Parent 2
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