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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 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
Here's what you need to know about the lambda Covid variant
By Holly Ellyatt