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US sends Covid-19 surge team to southwest Missouri after Delta variant fuels rise in cases and hospitalizations
By Aya Elamroussi
Why is Delta such a worry? It's more infectious, probably causes more severe disease, and challenges our vaccines
By Michael Toole
The lambda COVID-19 variant is now spreading in Canada — here's what you need to know
By Lauren Pelley & Michelle Meiklejohn
Delta plus variant of SARS-CoV-2: What do we know so far?
By Yella Hewings-martin
California spread of coronavirus' Delta variant alarms officials
By Rong-Gong Lin II & Luke Money
Here's what you need to know about the lambda Covid variant
By Holly Ellyatt
Pfizer Vaccine Less Effective Against Delta Infections but Prevents Severe Illness, Israeli Data Show
By Dov Lieber
Map: Tracking the Delta variant
By Mohammed Haddad