COVID-19: medRxiv and bioRxiv websites
These two websites, supported by Yale University and the British Medical Journal (BMJ) are holding platforms for draft manuscripts that have been submitted for publication but that have not yet been peer-reviewed.
All papers come with a cautious that results have not undergone this rigourous check,
As an indication of the volume of papers linked to COVID-19 SARS-CoV-2 there are already 1,687 articles online in PDF format (1,316 for medRxiv and 371 for bioRxiv).
To give an idea of how rapidly this holding site is increasing, by 18 May 2020 there figures had increased to 3565 Articles (2844 medRxiv, 721 bioRxiv).