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CDC data shows highly transmissible delta variant is now the dominant Covid strain in the U.S.
By Berkeley Lovelace & Berkeley Lovelace Jr.
Should fully vaccinated people continue to wear masks? Experts weigh in.
By Erika Edwards
All coverage
US sends Covid-19 surge team to southwest Missouri after Delta variant fuels rise in cases and hospitalizations
By Aya Elamroussi
The lambda COVID-19 variant is now spreading in Canada — here's what you need to know
By Lauren Pelley & Michelle Meiklejohn
Is it more infectious? Is it spreading in schools? This is what we know about the Delta variant and kids
By Margie Danchin, Fiona Russell & Archana Koirala
Delta now dominant coronavirus variant in the US, CDC says
By Arielle Mitropoulos & Morgan Winsor
Delta variant is California’s most dominant coronavirus strain
By Rong-Gong Lin II & Luke Money
Delta plus variant of SARS-CoV-2: What do we know so far?
By Yella Hewings-martin
Map: Tracking the Delta variant
By Mohammed Haddad
Virtually all new Covid deaths and hospitalizations are among unvaccinated people, White House says
By Kevin Breuninger
Here's what you need to know about the lambda Covid variant
By Holly Ellyatt