Why the AstraZeneca trial for a COVID-19 vaccine was put on hold

Highlights Hold on a trial was second incident for the AstraZeneca candidate vaccine trial Earlier, the AstraZeneca/Oxford trial was also paused when a patient developed neurological symptoms The trial was restarted after an independent committee determined the problems were not caused by the vaccine Review board found the symptoms came from undiagnosed multiple sclerosis, according to a company statement. If the adverse reaction were caused by the vaccine, millions of doses would simply be discarded. If the condition were to be linked to the vaccine, then scientists face another critical question. The problem could be caused by the vaccine technology - in this case, a harmless virus that...