COVID-19 vaccines were developed in record time – but are these game-changers safe?

Because Pfizer-BioNTech and Moderna vaccines have been developed in record time, many wonder whether companies cut corners or compromised safety.

 covid-19  pandemic  vaccines  sars-cov-2  pfizer  mrna  moderna  emergency-use-authorization  biontech  mrna-vaccine  pfizerbiontech-vaccine

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How mRNA vaccines from Pfizer and Moderna work, why they're a breakthrough and why they need to be kept so cold

There are two new COVID-19 vaccines that appear to be more than 90% effective. But what are these vaccines, and how are they different from those used previously?

 covid-19  pandemic  vaccines  sars-cov-2  cold-chain  covid-19-vaccine  pfizer  mrna  moderna  biontech

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