Covid-19: the crazy gamble of vaccines developed in record time

DECRYPTION – Faced with an emergency, research has been able to develop products that are as innovative as they are effective.

Less than a year after the start of the pandemic, the world already has half a dozen anti-Covid vaccines, all of them very effective. Not to mention the plethora of vaccines under development… A situation which, at the start of the crisis, was hardly considered in the most optimistic scenarios. In France, three vaccines are already available, those from Pfizer / BioNTech, Moderna and AstraZeneca. A fourth, developed by Janssen / Johnson & Johnson, has just been approved by the European Medicines Authority.

All are the result of recent technologies. The Pfizer / BioNTech and Moderna vaccines rely on messenger RNA, those of AstraZeneca and Janssen / Johnson & Johnson on a viral vector. In both cases, it is no longer a question of injecting an inactivated or weakened virus, but of making the body of the vaccinated person produce the viral proteins that he must learn to recognize in order to fight the infection. MRNA vaccines transmit genetic information directly to cells in

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