In late trials of their recent COVID-19 vaccine, Pfizer says their vaccine is now 95% effective and does not pose any safety concerns.
When injected with the vaccine, some cells produce pieces of spike protein which allows the immune system to develop antibodies to fight the virus. When an injected person is faced with COVID-19 in their body, their immune system is already prepared to kill off the virus.
Pfizer is seeking to send out their vaccine within days to get it out to the most vulnerable