Statement from Yale Faculty on Hydroxychloroquine and its Use in COVID-19

Gregg Gonsalves
7 min readAug 4, 2020

We write with grave concern that too many are being distracted by the ardent advocacy of our Yale colleague, Dr. Harvey Risch, to promote the assertion that hydroxychloroquine (HCQ) when given with antibiotics is effective in treating COVID-19, in particular as an early therapeutic intervention for the disease. As his colleagues, we defend the right of Dr. Risch, a respected cancer epidemiologist, to voice his opinions. But he is not an expert in infectious disease epidemiology and he has not been swayed by the body of scientific evidence from rigorously conducted clinical trials, which refute the plausibility of his belief and arguments. Over the last few weeks, all of us have spent considerable time explaining the evidence behind HCQ research, as it applies to early and late stage COVID-19 patients to the scientific community and general public, and now are compelled to detail the evidence in this open letter.

We are seriously alarmed for the safety of patients and the coherence and effectiveness of our national COVID-19 emergency response when misinformation about HCQ is spread and when rigorous scientific evidence and consensus produced by the community of expert researchers in infectious diseases, federal agencies and national and global health organizations are not heeded. Let us be clear: we are unanimous in our desire to see the development of therapies to treat COVID-19 and to prevent the transmission or acquisition of SARS-CoV-2. If HCQ was shown to be effective, even among subgroups of patients with COVID-19 in ongoing high quality trials, we would join our colleagues in promoting access to it for all who need it. However, the evidence thus far has been unambiguous in refuting the premise that HCQ is a potentially effective early therapy for COVID-19.

HCQ is used for the treatment of rheumatological diseases, such as lupus and rheumatoid arthritis. However, this does not ensure that the drug will be safe in patients with COVID-19 or in widespread use to treat early illness. In fact, rigorously-conducted clinical trials have found that HCQ is not effective as an early prophylactic therapy in preventing illness due to COVID-19 in people exposed to the virus. Furthermore, HCQ, alone or together with the antibiotic, azithromycin, has not been shown to be effective in…

Gregg Gonsalves

Gregg Gonsalves is an Assistant Professor in the Department of the Epidemiology of Microbial Diseases at Yale School of Public Health.