China scrambles as delta strain strikes megacities

China is calling for tighter seals on its borders as Covid-19 infections rise in its two southern megacities, where holes in their defenses have allowed the highly contagious delta strain to spread since May. The lives of up to 60 million people in Guangzhou and Shenzhen, as well as surrounding areas, have been upended by … Continue reading China scrambles as delta strain strikes megacities