Looking around the forum it seems that no one is working with X-Ray data for COVID-19. There is a new dataset on Kaggle:
https://www.kaggle.com/tawsifurrahman/covid19-radiography-database
They released a new paper pre-print as well:
https://arxiv.org/abs/2003.13145
I was deeply surprised by the awesome results I was able to get using Fastai2 !