well duh…
>pic related
you guessed it
Study Objective:
To test if post-exposure prophylaxis with hydroxychloroquine can prevent symptomatic COVID-19 disease after known exposure to the SARS-CoV-2 coronavirus.
To test if preemptive therapy with hydroxychloroquine early in the sypmptomatic COVID-19 disease course can prevent progression of persons with known symptomatic COVID19 disease, decrease hospitalization.
https://clinicaltrials.gov/ct2/show/NCT04308668?cond=Covid-19&cntry=US&draw=2&rank=5