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a scientific paper that has been published before being peer-reviewed. So it’s gone through an initial “SPAM filter” type screen but it hasn’t gone through the (hopefully) rigorous peer-review process that takes before articles are published in journals. Preprints can be great for getting information out quickly (like during a pandemic!) but the results need to be treated as “preliminary” and given an extra level of scrutiny. Preprints are posted on servers including bioRxiv and medRxiv.