其他
钟南山：目前国产常用疫苗对德尔塔变异株还是有效的，大家应该打
Zhong Nanshan, China's top epidemiologist, said that China's inactivated vaccines can provide protection against the Delta variant. Also, he encouraged more people to get vaccinated.
新冠变异病毒德尔塔毒株在美国未接种疫苗者中有如“野火般”传播的风险
白宫承认无法达成独立日接种目标，福奇称“德尔塔”成应对疫情最大威胁