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HCQ study #53 of 230
6/9 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Bhattacharya et al., medRxix, doi:10.1101/2020.06.09.20116806 (Preprint)
Pre exposure Hydroxychloroquine use is associated with reduced COVID19 risk in healthcare workers
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HCQ reduced cases from 38% to 7%. 106 people. No serious adverse effects.

Bhattacharya et al., 6/9/2020, retrospective, India, South Asia, preprint, 7 authors.
risk of COVID-19 case, 80.7% lower, RR 0.19, p = 0.001, treatment 4 of 54 (7.4%), control 20 of 52 (38.5%).
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