Coronavirus: what does suspension of Oxford-AstraZeneca trials tell us about vaccine development?

Oxford University and pharmaceutical giant AstraZeneca have suspended clinical trials of a potential Covid-19 vaccine pending an independent investigation after “a potentially unexplained illness” was found in a volunteer, but scientists said it was too early to tell if it was linked to the vaccine.Jeremy Farrar, director of London-based research charity Wellcome Trust, said the investigators would have to find out if the illness was caused by the vaccine candidate, the placebo or the control…

from South China Morning Post https://www.scmp.com/news/china/science/article/3100900/coronavirus-what-does-suspension-oxford-astrazeneca-trials-tell