Imbalanced bacterial community in the gums connected to Alzheimer’s infection biomarker Kumar Jeetendra | April 12, 2021 Older adults with more harmful than healthy bacteria in their gums are more likely to have evidence for amyloid beta–a key biomarker for Alzheimer’s disease–in their cerebrospinal fluid (CSF), according to new research from NYU College of Dentistry and Weill Cornell Medicine. However, this imbalance in oral bacteria was not associated with another Alzheimer’s biomarker …