How Oxford- AstraZeneca covid-19 vaccine went from pole position to troubled start
Vaccines are the world's best hope of ending a pandemic that has claimed more than 1.7 million lives globally
Oxford and AstraZeneca are now hoping for quick authorization by Britain's regulator
LONDON : On June 5, researchers at the University of Oxford quietly made a change to a late-stage clinical trial of their COVID-19 vaccine. In an amendment noted in a document marked CONFIDENTIAL, they said they were adding a new group of participants.