Why are virus-targeting immune cells sniffing around Alzheimer’s patients’ brains?

Myeloid immune cells
Myeloid immune cells alongside red blood cells in an electron micrograph of human blood. Credit: National Cancer Institute

In a new study published in Nature, Stanford neuroscientist Tony Wyss-Coray, Ph.D., and his colleagues report the startling discovery of virus-obsessed immune cells in autopsied brains of deceased Alzheimer’s patients, and in cerebrospinal fluid (which bathes our brains) of living individuals diagnosed with the disease.

The scientists not only found a heightened presence of immune cells called T cells in Alzheimer’s patients’ brains and , but showed that surprising numbers of those T cells were “aimed” at telltale features of Epstein-Barr virus.

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