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HCQ study #81 of 230
7/10 Late treatment study
Chen et al., PLOS ONE, doi:10.1371/journal.pone.0242763 (Peer Reviewed)
A Multicenter, randomized, open-label, controlled trial to evaluate the efficacy and tolerability of hydroxychloroquine and a retrospective study in adult patients with mild to moderate Coronavirus disease 2019 (COVID-19)
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2 very small studies with hospitalized patients in Taiwan.
RCT with 21 treatment and 12 SOC patients. No mortality, or serious adverse effects. Median time to negative RNA 5 days versus 10 days SOC, p=0.4. Risk of PCR+ at day 14, RR 0.76, p = 0.71.
This paper also reports on a small retrospective study with 12 of 28 HCQ patients and 5 of 9 in the control group being PCR- at day 14, RR 1.29, p = 0.7.

Chen et al., 7/10/2020, Randomized Controlled Trial, Taiwan, Asia, peer-reviewed, 19 authors.
risk of no virological cure, 24.0% lower, RR 0.76, p = 0.71, treatment 4 of 21 (19.0%), control 3 of 12 (25.0%), day 14.
median time to PCR-, 50.0% lower, relative time 0.50, p = 0.40, treatment 21, control 12.
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