Controlled study on chloroquine showing that it is not effective:
New study casts doubt on hyrdoxychloroquine’s effectiveness in treating coronavirus – TechCrunch
The Techcrunch article is misleading and internally contradictory as the control was not "no treatment" but "conventional treatment" in China, which the article goes on to note includes antivirals.
I haven't read the study but a summary on reddit said 80% of the control group received interferon (plus other antivirals). A pilot study of hydroxychloroquine in treatment of patients with common coronavirus disease-19 (COVID-19) : COVID19
Other limitations:
- only 15 patients given hydroxychloroquine plus 15 given the control (30 patients total)
- they used a lower dose of hydroxychloroquine than Dr. Raoult's study suggested was most effective
- they didn't test combination with Azythromicin
Bottom line: this is not a very well constructed study and doesn't add much to the equation. Hopefully some of the larger clinical trials in the pipeline will shed more light on the effectiveness of CQ/HCQ with and without Azythromicin.