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'Breakthrough' Infections Do Not Mean COVID Vaccines Are Failing
By Emily Willingham
A Doomsday COVID Variant Worse Than Delta May Be Coming, Scientists Say
By David H. Freedman
CDC: COVID vaccines won't stop transmission; Fully vaccinated can still get, spread Delta strain
By Mike Sunnucks
Fully vaccinated people who get a Covid-19 breakthrough infection can transmit the virus, CDC chief says
By Christina Maxouris & Madeline Holcombe
Delta infections among vaccinated likely contagious; Lambda variant shows vaccine resistance in lab
By Nancy Lapid
3 charts show how far Covid delta variant has spread around the world
By Nee Lee & Yen Nee Lee