PARIS, France (AFP) — Dozens of companies, from biotech start-ups to Big Pharma, are racing to develop a safe and effective Covid-19 vaccine, both to meet urgent medical need and for the potential payday. Here’s an update on the quest for a magic bullet against the coronavirus that has already killed more than a million people worldwide. How many in the pipeline? The World Health Organization (WHO) has identified 42 “candidate vaccines” at the stage […]