The inactivated virus was used in the vaccine to ensure it was safe for use.
Biology, Medicine: (of a virus, vaccine, or other pathogen) killed or rendered non-infectious while retaining the ability to stimulate an immune response.
The polio shot contains an inactivated virus that cannot cause disease.
inactivateverb
To make something inactive or inoperative.
The technician will inactivate the alarm system during the maintenance work.
To render a substance, such as a virus or enzyme, inactive or non-functional.
The vaccine works by inactivating the virus, preventing it from causing disease.