A viral vector vaccine is created when genetic substance from a COVID-19 virus is inserted into a unrelated, harmless virus. When the viral vector will get into your cells, it delivers genetic substance from the COVID-19 virus that offers your cells instructions for how to make the spike protein discovered on the surface of the COVID-19 virus. Once your cells displace the spike proteins on their surfaces, your immune process generates antibodies that can struggle the COVID-19 virus.