Immune Systems of Healthy Adults 'Remember' Germs to Which They've Never Been Exposed: Researchers

The immune system develops a "memory" of a microbial pathogen, with a correspondingly enhanced readiness to combat that microbe, only upon exposure to it - or to its components though a vaccine. This is an established dogma. But a discovery by Stanford University School of Medicine researchers casts doubt on that dogma. In a path-breaking study to be published online Feb. 7 in iImmunity/i, the investigators found that over the course of our lives, CD4 cells ...

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