The allergic basis of #COVID19 severity explains why #Cetirizine/ #Famotidine/ #Vitamin C/ #Hydroxychloroquine (HCQ) work. Allergies are caused by IgE antibodies against the allergens. IgE's natural role is defending against parasites (like malaria, hookworms).
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Medications that reduce IgE levels (HCQ), block histamine (Cetirizine - histamine H1 blocker, Famotidine - histamine H2 blocker) or in the case of Vitamin C, metabolizing excess histamine, all therefore help in COVID-19.
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So HCQ helps in COVID-19, for the same reason it works in malaria, RA, lupus and asthma.

Mast cell stabilizers work at the root of the problem.

COVID-19: Famotidine, Histamine, Mast Cells, and Mechanisms
https://www.researchsquare.com/article/rs-30934/v2
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So mast cell stabilizers, cetirizine, famotidine, Vitamin C, HCQ can all be used IMMEDIATELY to help save lives NOW.
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