A coronavirus vaccine developed by the University of Oxford appears safe and induces a strong immune response within the body, scientists announced on Monday after the first phase of "promising" human trials against the deadly disease that has infected over 1.45 crore people and claimed more than six lakh lives across the world. Doses of the vaccine were given to 1,077 healthy adults aged between 18 and 55 in five UK hospitals in April and May as part of the phase one clinical trial and results, published in the ‘Lancet’ medical journal.