COURTESY BY: https://www.hindustantimes.com/ United States President Donald Trump on Wednesday got the world guessing when he fired a one line tweet: “Great News on Vaccines!” It was not immediately clear as to where this vaccine was being developed and how far along was it as the US President was miserly with details. Positive news on initial trials of the University of Oxford’s potential Covid-19 vaccine that has been licensed to AstraZeneca could be announced as soon as Thursday, reported Reuters quoting an editor of Britain’s ITV. A Moderna Inc vaccine…