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By now, we know for sure (confirmed by studies) that several natural substances work to prevent Coronavirus (Covid-19), so we are NOT dependent on Hydroxychloroquine - which btw also works perfectly, look up "whitecoat medical summit" in the Internet - anymore :-)
The latest news is that Quercetin and zinc can replace Hydroxychloroquine and zinc, according to Dr. Zelenko from New York, so ANYONE can successfully prevent Coronavirus (Covid-19) now, here two texts about it, Vitamine D works too (!):
https://read.cash/@medicineman9/how-to-prevent-and-cure-coronavirus-covid-19-6fa0a26b