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what you are saying could be explained if the active principle is the zinc rather than the HCQ.

Quite true. I don't think anybody has looked at that. That would be hilarious, if it was true. Zinc is even cheaper than HCQ, and probably far less dangerous. I'd love to see a four-way random double blind study: Placebo, zinc, HCQ + zinc, and quercetin + zinc. That would be incredible. And also start treatment upon first symptoms.