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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
Map: Tracking the Delta variant
By Mohammed Haddad
Study highlights need for full Covid vaccination to protect against Delta variant
By Elizabeth Cooney
Coronavirus Updates: Covid News: Biden Calls For New Vaccination Push (Published 2021)
By Michael D. Shear, Sheryl Gay Stolberg & Carl Zimmer