The pausing of COVID-19 vaccine trials at AstraZeneca is a timely reminder that nothing in the sphere of scientific research is ever guaranteed. So, anyone who claims we could have a vaccine before November is either delusional or doesn’t understand science or both.
That is not to say that the clinical trials won’t be resumed. But a vaccine that could be rolled out to billions of people around the world needs to be 100% safe. And a few short months is not long enough to determine if the vaccine will have any long-term adverse effects….
…. It might work at preventing viral infections in thousands of test subjects. But that should only be just one of many considerations. A bigger question would be how might a vaccine that is, say, derived from an adenovirus virus found in chimpanzees affects us and future generations? That is not something that can be answered in a matter of months....