One very interesting paper concerning COVID-19 was the paper describing the first isolation of the virus by Harcourt et al. However, this paper as far as I can tell was only published as a preprint in May of 2020 describing research done in January and February of 2020. I used Google Scholar and other web searches and I cannot find any indication that the paper was ever peer reviewed and published in a journal. Since it is such an important paper, it seems kind of surprising to me that after a year and half the paper seems to still be unpublished. Am I missing something here?
It was published in June of 2020 by Emerging Infectious Disease under a slightly modified title. (It's not uncommon for journal editors and/or peer reviewers to require changes to the title of a manuscript prior to publication).
Found as the top result under "Similar Articles" on PubMed page of the bioRxiv pre-print. PMC link and full citation below.
Harcourt J, Tamin A, Lu X, Kamili S, Sakthivel SK, Murray J, Queen K, Tao Y, Paden CR, Zhang J, Li Y, Uehara A, Wang H, Goldsmith C, Bullock HA, Wang L, Whitaker B, Lynch B, Gautam R, Schindewolf C, Lokugamage KG, Scharton D, Plante JA, Mirchandani D, Widen SG, Narayanan K, Makino S, Ksiazek TG, Plante KS, Weaver SC, Lindstrom S, Tong S, Menachery VD, Thornburg NJ. Severe Acute Respiratory Syndrome Coronavirus 2 from Patient with Coronavirus Disease, United States. Emerg Infect Dis. 2020 Jun;26(6):1266-1273. doi: 10.3201/eid2606.200516. Epub 2020 Jun 17. PMID: 32160149; PMCID: PMC7258473.