德尔塔变异毒株已传至74国 或成全球主流毒株

德尔塔毒株不但传染性强，而且似乎会引发更严重的症状，包括腹痛、恶心、呕吐、食欲不振、听力丧失和关节痛。

最早在印度被发现的德尔塔新冠变异毒株已经传播到了74个国家，这一毒株不但传染性强，而且感染者更易发展成重症。目前英国超90%的新病例都感染了德尔塔毒株，美国感染该毒株的人数也在急剧增加。     The Delta variant of Covid-19, first identified in India, has been detected in 74 countries and continues to spread rapidly amid fears that it is poised to become the dominant strain worldwide.