Categories Articles Tweaking COVID-19 vaccines will keep them effective against new variants Post author By crystalg Post date January 29, 2021 The Verge – All Posts Tags against, COVID19, Effective, Keep, Them, Tweaking, vaccines, variants ← Report: Bureau of Prisons Withheld Information on Positive COVID-19 Tests Among Federal Execution Witnesses → Find opportunities in the crisis and grow your business model