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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?
Pfizer stock surged higher on Nov. 9 after the company announced its vaccine is “90% effective” against COVID-19 infections. KENA BETANCUR/AFP via Getty Images

Why we didn’t get a vaccine by Election Day – but why we may get one soon

With COVID-19 cases soaring across the US and worldwide, the need for a vaccine could not be greater. Here's where we stand on vaccine development, including positive results from Pfizer's trial.
A new study published in the New England Journal of Medicine, discloses the results from phase 1 of Moderna’s COVID-19 vaccine trials. YurolaitsAlbert / Getty Images

Video: An infectious disease expert explains the results from Moderna’s latest vaccine trials

The results from the phase 1 trial are a promising first step in showing that the mRNA vaccine is a viable candidate, but there are unanswered questions and it is still early in the process.
Moderna just released the results of a phase 1 trial for a COVID-19 vaccine. JOSEPH PREZIOSO/AFP via Getty Images

What the phase 1 trials of the first COVID-19 vaccine really mean

Results from phase 1 trials of a COVID-19 mRNA vaccine created a burst of optimism. But details the company failed to release suggest it is too early to speculate whether the vaccine is effective.

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