No, the Pfizer/BioNTech COVID-19 vaccine does not have any viable virus particles so the vaccine cannot cause disease. The Pfizer and BioNTech vaccine is an mRNA (messenger ribonucleic acid) vaccine which uses the genetic sequence for the spike protein from the surface of the SARS-CoV-2 virus to enable it to be transported into the cells of the body. The cells then produce the spike proteins which allow our immune system to produce antibodies and activate T-cells to respond to any future encounter. This does not cause COVID-19 but means that if the body is exposed to the virus, the immune system would recognise and attack the virus.
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