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Will a vaccine be enough?

The Guardian takes a look at the promise of a vaccine to combat coronavirus and whether a vaccine will be sufficient to allow for something resembling normal life to return.

A vaccine may not be enough on its own, but it is necessary. It is the only proven way to reach “herd immunity” – when so many of the population (thought to be at least 60% for Covid-19) are immune to the virus that an infected person contacts very few non-immune people and, unable to find new hosts, the virus dies out. …

We will know before the year’s end whether some of the 11 vaccines now in large-scale trials actually work. The US-based firm Pfizer and its partners are among the farthest along the track, partly because their vaccine is made of mRNA that codes for a virus protein, which is quick to produce.

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