Valpodoc85
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With regards to the flu shot. The human immune system has both adaptive and innate. The innate system handles 90+% of infections. Adaptive is the development of disease specific proteins such as antibodies. We get vaccinated to turn on the adaptive properties of immunity. However, any immunologic challenge, such as a vaccination with ramp up the innate system. Supercharge it in a way. So when you get the flu vaccine it ramps up the innate system and this protects you from covid. Robert Gallo, the famous virologist, suggested oral polio vaccine as a way to diminish covid early in the pandemic.