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What breakthrough infections mean for the Covid vaccines
By Denise Chow
Why the Delta variant is spreading so much faster than other coronavirus strains
By Theresa Waldrop
COVID on the rise, overwhelmingly among the unvaccinated
By Sam Baker
After being ravaged by the delta Covid variant, how is India doing now?
By Holly Ellyatt
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Delta variant takes hold in developing world as infections soar
By John Burn-Murdoch & David Pilling
The Delta variant is driving up COVID rates. See the states where it's most prevalent
By Nicolas Rapp & Erika Fry
Hospitalized Covid-19 patients are asking for the vaccine -- when it's too late, two health care workers say
By Jason Hanna
Covid-19 hospitalizations and deaths are increasing, and the vast majority were not vaccinated
By Holly Yan & Madeline Holcombe