Pfizer, the first company to get U.S. emergency use authorization for a COVID-19 vaccine, swung to a small profit in the fourth-quarter as it started shipping vaccines globally. The drugmaker expects roughly $15 billion in revenue this year from the vaccine, which won emergency clearance in mid-December from U.S. regulators and continues to rack up approvals across the globe. The two-dose vaccine is about 95% effective and is one of only a few vaccines available to check the global pandemic. Rising medicine sales helped offset big increases in spending on research and production as the New ...