coronavirus that has claimed 1.4 million lives began spreading across the globe, a number of highly promising Covid-19 vaccines are on the cusp of release.Health authorities could give a green light for emergency use within weeks, which would mark the most rapid vaccine development for a pandemic in history -- but many questions remain.When will a jab be available?After months without a visible breakthrough, everything sped up in November, when several pharmaceutical companies made encouraging preliminary announcements about the efficacy of their vaccines.The European Medicines Agency (EMA), charged with overseeing drug approval in the European Union, told AFP that it could approve the first Covid-19 vaccines by the end of the year, or.