To make the vaccine, therefore, you'll need to separate the cowpox viruses from the rest of the fluid. Fill the syringe with the purified cowpox viruses. The smallpox vaccine is a live vaccine ...

Fill the syringe with a strain of the virus that ... You have just produced a live-attenuated measles vaccine. Like the smallpox vaccine, the virus within the vaccine will invade body cells ...

he is subsequently immune to smallpox. 1870s Vaccine research becomes an area of scientific study under Louis Pasteur. 1960s The development of disposable, plastic syringes makes vaccination ...