2nd coronavirus vaccine shows striking success in U.S. tests

A second experimental COVID-19 vaccine — this one from Moderna Inc. — yielded extraordinarily strong early results Monday, another badly needed dose of hope as the pandemic enters a terrible new phase.Moderna said its vaccine appears to be 94.5% effective, according to preliminary data from an ongoing study. A week ago, competitor Pfizer Inc. announced its own COVID-19 vaccine appeared similarly effective — news that puts both companies on track to seek permission within weeks