Nature: What Pfizer’s landmark COVID vaccine results mean for the pandemic

Nature: What Pfizer’s landmark COVID vaccine results mean for the pandemic. “The vaccine, which is being co-developed by BioNTech in Mainz, Germany, consists of molecular instructions — in the form of messenger RNA — for human cells to make the coronavirus spike protein, the immune system’s key target for this type of virus. The two-dose vaccine showed promise in animal studies and early-stage clinical trials. But the only way to know whether the vaccine works is to give it to a large number of people and then follow them over weeks or months to see whether they become infected and symptomatic. These results are compared with those for a group of participants who are given a placebo.”

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