AfricanSkies
Some vaccine development can indeed be done in parallel that is true. Multiple labs working on multiple potential vaccines certainly increases the chances of one of them working. You can also mass produce before you have finished testing, so you are ready to go the moment a particular vaccine tests successfully. However you do so in the knowledge that most of that effort will just be for nothing because the testing for most, if not all potentials will prove unsuccessful. (I suspect some people do not realise what the testing is for. It is not just to test whether the vaccine provides immunity. It also determines side effects, which can very easily outweigh the benefits). I personally think we would have to get very lucky indeed, to have a useful vaccine by September - it is not impossible as technical advancements in vaccine development and testing are bound to come with so many people focussed on it, but even so the chances are slim.