After months of steady decline, Covid-19 cases have seen abrupt increases in jurisdictions that have relaxed pandemic precautions, the Centers for Disease Control (CDC) reported Wednesday. Reduced precautions in places of business, large-scale social gatherings, and educational activities have seen a spike in incidents of the more transmissible variants of SARS-CoV-2, including the variant B.1.1.7. The transmission of B.1.1.7, as well as all...