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How the Pfizer Covid-19 Vaccine Works

How the Covid-19 Vaccine Works

Pfizer recently announced their vaccine is 90% effective, so I thought I explain how the Covid-19 vaccine works. There is a wide variety of RNA viruses The West Nile virus belongs there, so does the hepatitis A and C virus. Poliovirus, the Corona viruses (SARS, Covid-19 coronavirus),
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