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Most colds are caused by rhinoviruses, but there are around 160 different types and they mutate very easily or learn to hide from the immune system. James Gallagher, the Â鶹Éç's health and science correspondent, spoke to Claudia Hammond about how researchers have been targeting an essential protein inside our cells which the viruses need to replicate. (Image: Woman with flu sneezing. Credit: Getty Images.)