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When an RSV vaccine became available for use during pregnancy, it offered a natural experiment between various countries to see how it compared to a one-time antibody injection
You might expect a child's belief in Santa Claus 鈥� with his ability to discern whether children have been naughty or nice 鈥� would have an impact on their behaviour. But it turns out other festive trappings like Christmas jumpers and carols may play a more important role