“The first Covid-19 shots have been given to more than 2.7 million people in six< countries, according to data collected by Bloomberg. It’s the start of the biggest vaccination campaign in history and one of the largest logistical challenges ever undertaken. Vaccinations in the U.S. began Dec. 14 with health-care workers, and so far 1.12 million doses have been administered, according to a state-by-state tally by Bloomberg. Those numbers are accelerating as a second vaccine by Moderna Inc. is distributed…”