The chapter explores a study where volunteers were exposed to a small dose of COVID through the nose to observe their immune response, revealing differences in responses among individuals who either developed full infections or showed minimal symptoms. It emphasizes the significance of mucosal cells in the nose as the initial defense against infections and the potential for stronger immune responses to prevent severe infections.
Ian Sample and science correspondent Hannah Devlin discuss some of the science stories that have made headlines this week, from a glimpse of a black hole awakening, to a new blood test that can detect Parkinson’s seven years before symptoms appear, and a study exploring how some people manage to avoid Covid infection. Help support our independent journalism at
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