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letter
. 2020 Apr 6;53:e20200155. doi: 10.1590/0037-8682-0155-2020

TABLE 1: Open questions to be answered regarding the use of chloroquine against Covid-19.

Research question Expected outcome
Does it work to prevent infection? Decrease in confirmed infections in a cohort of uninfected individuals
Pre- and post-exposure prophylaxis
Does it work to prevent clinical disease? Decrease in proportion of patients that develop clinical symptoms
Clinical disease prevention
Does it work to prevent clinical severity? Decrease in proportion of patients with onset of severe disease (SARS criteria, need for respiratory support, ICU admission, post-infection respiratory sequelae)
Severe clinical disease prevention
Does it work to prevent death? Reduced mortality in severe cases (hospitalized patients)
Mortality prevention
Does it decrease viral load in blood and secretions? Rapid viral clearance after treatment
Viral load