The Covid-19 outbreak in the United States crossed 100,000 new confirmed daily infections Saturday, a milestone last exceeded during the winter surge and driven by the highly transmissible Delta variant and low vaccination rates in the south.

Health officials fear that cases, hospitalisations and deaths will continue to soar if more Americans don’t embrace the vaccine. Nationwide, 50% of residents are fully vaccinated and more than 70% of adults have received at least one dose.