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https://www.covid-19forum.org/index.php?topic=227.0
Health care workers all in same area all using same PPE
After 3.5 months
788 treated none got infected
407 untreated 236 people, or 58 percent
Dr. Hector Carvallo, a professor of medicine at the University of Buenos Aires, gave 788 doctors and other health care workers in three medical centers weekly Ivermectin prophylaxis, with a control group of 407 doctors and others who didn't get the drug. In the control group 236 people, or 58 percent, "had become ill with COVID." Among the 788 who got Ivermectin, "no infections were recorded."
17 minute 40 second mark in this video
https://www.youtube.com/watch?v=CB6Bvi_g-w8
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