How does the Moderna Covid-19 vaccine work?

Trials of the Moderna coronavirus vaccine suggest it is 94% effective againstCovid-19, and it has now been approved for UK use. Furthermore, no person whowas vaccinated with the jab, known as mRNA-1273, developed severe coronavirus.US firm Moderna has said its trial results indicate the jab is generally welltolerated with no serious safety concerns.

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