Efficacy of early #HydroxyChloroquine treatment in preventing #COVID19 pneumonia aggravation, the experience from Shanghai, #China The median time to clinical improvement: - 6 days, HCQ used early group - 8 days, HCQ not used early group - 9 days, no HCQ https://t.co/I7Qgghq4gE https://t.co/sdvtwigxSl