What is a vaccine and how do they work? Find out in Science with Sam

The most pressing question of 2020 is when will we get a vaccine for covid-19? But what actually is a vaccine? How do they work? And what does it take to develop a new one? This week Science with Sam explores everything you need to know about vaccines from memory cells to attenuated viruses and explains why vaccines are one of the most significant medical developments in the history of the world.

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