But the speed at which the vaccine is being pursued - vaccines normally take 10 to 15 years to develop - may increase the likelihood of unforeseen problems. The vaccine, developed by Oxford University, is being tested in thousands of people in Britain and the US, and in smaller study groups in Brazil and South America. Pictured: A Brazilian volunteer receiving the Oxford vaccine, July 24Trials for AstraZeneca's shot are underway in the US, UK, Australia, Brazil (pictured) and other nations. Brazil is currently in one of the worst Covid-19 crises in the world with more than 3.6million official cases so far and 114,000 deaths. UK The UK is the host of research and development efforts of the vaccine, which has been developed by researchers in Oxford and will be manufactured by AstraZeneca, a company based in Cambridge.
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