A seemingly strange phenomenon of a smaller dose of the Oxford-AstraZeneca Covid-19 vaccine being more effective than a bigger one is reportedly explained by it first being tested on a younger group. On Monday, the pharmacological company announced that its AZD1222 vaccine for Covid-19, which is based on a common cold virus that causes infection in chimpanzees, has an efficacy of 70 percent. The number is average for two slightly different tests. One involved people, who received half a dose of the vaccine, followed by a full dose a month later, while the larger second group took full doses for both shots. Counterintuitively, the first
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