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The body contains 10 times more bacteria, fungi and other micro-organisms than human cells. Most of these species are harmless--although they can still cause illness if they wind up in the wrong place

By Helen Thompson of Nature magazine Exposure to germs in childhood is thought to help strengthen the immune system and protect children from developing allergies and asthma , but the pathways by which this occurs have been unclear. [More]

A while ago, I wrote about how Helicobacter pylori , the bacteria that cause stomach ulcers and are implicated in certain stomach cancers, cause the cells of the stomach wall to die . H.

An American is among the three winners of Nobel Price in medicine for their work on understanding the immune system.