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Articles on Immunity

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New mRNA vaccines use genes from the coronavirus to produce immunity. Andriy Onufriyenko/Moment via Getty Images

How do mRNA vaccines work – and why do you need a second dose? 5 essential reads

So far, most vaccines in the US are mRNA vaccines. These represent a new technology and are likely to take over the vaccine world. But how do they work? What are their weaknesses? Five experts explain.
Vaccinated people are wondering whether they can ease social distancing and mask-wearing. AP Photo/Darko Bandic

Can vaccinated people still spread the coronavirus?

You’ve been vaccinated; can you now safely see your friends and family? New research hints that vaccinated people may be less likely to transmit the coronavirus, but they are not 100% in the clear.
People wearing masks walk in front of Pfizer’s headquarters in New York City. Pfizer and BioNtech are on track with a vaccine that is 90 per cent effective, say preliminary results, but they are not the only ones in the race. AP Photo/Bebeto Matthews

COVID-19 vaccine update: Pfizer may be the frontrunner, but Canada has hedged its bets

Canada has set aside a total of 414 million doses of different types of vaccine. Some exploit known mechanisms, others are based on previously untested approaches.
Palak Mehta

Curious Kids: how do vaccines kill viruses?

Vaccines work by teaching your immune system about new viruses. Your immune cells are very clever – they will remember what they learnt, and protect you if you encounter that virus in the future.

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