Scientists are racing to understand why some patients have persistent symptoms, especially brain fog, after a bout with COVID-19
Another hypothesis gaining traction is that a viral, bacterial, or even fungal infection could set off a series of events leading to neurodegeneration.
Researchers currently categorize two types of Alzheimer’s disease: early-onset, which begins during a person’s 40s or 50s, and late onset, which doesn’t strike until age 65 or older. Early-onset Alzheimer’s, which affects showing accumulation of beta-amyloid in patients long before symptoms set in. Trojanowski suggested that Alzheimer’s starts when beta-amyloid proteins clump into plaques between neurons in the hippocampus and gradually spread outward. As these accumulate, they trigger the formation of abnormal tau proteins inside the cells that then interrupt neuronal communication and memory formation.
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