On May 11, 2020, a study was published in JAMA Network that attempts to answer the question whether there is an association between use of hydroxychloroquine, with or without azithromycin, and in-hospital mortality among patients with coronavirus disease 2019 (COVID-19).

The results showed that among patients hospitalized with COVID-19, treatment with hydroxychloroquine, azithromycin, or both was not associated with significantly lower in-hospital mortality.