NCBI SARS-CoV-2 ResourcesNCBI SARS-CoV-2 resources, including: articles referencing SARS-CoV-2 and COVID-19 in PubMed; free full-text content in PubMed Central (PMC), including preprints, from the Public Health Emergency COVID-19 Initiative, suitable for text mining and secondary analysis; LitCovid: Comprehensive curated literature collection regarding the 2019 novel Coronavirus; full-text COVID-19 guidelines and reviews in Bookshelf.