
The multicenter study of 547 autoimmune patients found that long-term hydroxychloroquine (HCQ) use did not protect against COVID-19. Patients not exposed to HCQ had a lower risk of infection and severe disease. Immunosuppressants (IS) also did not influence vaccine response. Only patients with two or more exposures (vaccination or infection) developed strong immunity. These findings challenge HCQ’s role in COVID-19 prevention.
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