Use the tissue culture to grow new viruses. You are about to create a live-attenuated vaccine, which means that you need to alter a pathogen—in this case a measles virus—so that it will still ...

Live attenuated vaccines are antigenic substances composed of a viable (living) pathogen, such as a virus or bacterium. The pathogen is altered so that it is less virulent or avirulent (attenuated).

The novel live-attenuated SARS-CoV-2 nasal vaccine candidate is highly safe, induces robust cellular and mucosal immunity, and generates long-lasting neutralizing antibody titers.