Delta orders 100 Boeing 737 MAX jets worth $13.5 bn
Delta CEO says 8,000 employees have tested positive for Covid in last 4 weeks
Vaccines prevent severe COVID, even from Delta
US approaching Delta wave peak
Delta does not cause more severe childhood COVID
US consumer confidence drops on Delta fears
China cases rise as Delta variant challenges Beijing
COVID-19 returns to Wuhan as global Delta woes mount
US documents sound alarm on Delta variant
