Hydroxychloroquine doesn't prevent COVID-19, study findsProphylactic hydroxychloroquine treatment was not associated with any risk difference for COVID-19 infection, according to an International Journal of Infectious Diseases study yesterday.The researchers followed a cohort of all 5,488 Danish people who used hydroxychloroquine in both 2019 (for non–COVID-19 reasons) and 2020 and matched them with 54,846 non-users by age and sex.
The primary outcome was a COVID-19 diagnosis from Feb 27 to Nov 27, 2020.Infection rates were comparable between the two groups, with 3.4% of the hydroxychloroquine group and 3.7% of the control group receiving positive diagnoses.