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$This picture taken on November 18, 2020 shows a syringe and a bottle reading \Vaccine Covid-19\ next to the Moderna biotech company logo. - The CEO of Moderna warned European countries on November 17 that dragging out negotiations to purchase its promising new Covid-19 vaccine will slow down deliveries, as other nations that have signed deals will get priority. The biotech company Pfizer said the day after that a completed study of its experimental Covid-19 vaccine showed it is 95 percent effective, after Moderna said its own vaccine was 94.5 percent effective, according to a preliminary analysis. (Photo by JOEL SAGET / AFP)$ Science