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Artículos sobre Herd immunity

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A volunteer gets an injection of Moderna’s possible COVID-19 vaccine on July 27, 2020. Moderna announced Nov. 16 that its vaccine is proving highly effective in a major trial. (AP Photo/Hans Pennink)

COVID-19 vaccines: How Pfizer’s and Moderna’s 95% effective mRNA shots work

Two pharma companies have announced early COVID-19 vaccine trial results with over 90 per cent effectiveness. What does that mean for getting back to normal?
The Grand Hotel Taipei in Taiwan lights up rooms to mark five days with no new COVID-19 cases. Ricky kuo/Shutterstock

Is reaching zero COVID-19 possible?

With a vaccine, yes, elimination is possible. But we need to be realistic about how long this might take.
Billions of people are going to need a coronavirus vaccine and that demand is going to be hard to meet. Francesco Carta fotografo/Moment via Getty Images

Approval of a coronavirus vaccine would be just the beginning – huge production challenges could cause long delays

Once a coronavirus vaccine is approved, billions of doses need to be manufactured. Current vaccine production is nowhere near ready, for a variety of reasons, but planning now could help.

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