This study by the Henry Ford Health System, a hospital system in Michigan, reports about 50% reduction in deaths in China virus patients who were given hydroxychloroquine.
https://www.henryford.com/news/2020/07/hydro-treatment-study
Journalist Sharyl Attkisson provides an excellent summary of the study at the following link. Her report includes the following informative graphic.

Here is Sharyl Attkisson’s summary report on the study:
BREAKING: Hydroxychloroquine lowers Covid-19 death rate, study finds
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About budbromley
Bud is a retired life sciences executive. Bud's entrepreneurial leadership exceeded three decades. He was the senior business development, marketing and sales executive at four public corporations, each company a supplier of analytical and life sciences instrumentation, software, consumables and service. Prior to those positions, his 19 year career in Hewlett-Packard Company's Analytical Products Group included worldwide sales and marketing responsibility for Bioscience Products, Global Accounts and the International Olympic Committee, as well as international management assignments based in Japan and Latin America. Bud has visited and worked in more than 65 countries and lived and worked in 3 countries.
Sharyl Attkisson interviews Dr. William O’Neill of Henry Ford Medical System: http://fullmeasure.news/news/cover-story/hydroxychloroquine