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New guidelines for the diagnosis of Alzheimer's disease are to be released today by the National Institute on Aging and the Alzheimer's Association, reports The New York Times. The new definition breaks the disease down into three stages: when dementia has set in, when there are symptoms, but the person can still perform daily tasks, and when there are not yet symptoms, but changes are occurring in the person's brain. That early, symptom-free stage would be assessed through biomarkers.

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In a letter, about two dozen researchers criticize the World Health Organization investigation into the origins of SARS-CoV-2 and call for a new inquiry, the Wall Street Journal reports.

National Geographic reports that nine great apes at the San Diego Zoo have been vaccinated against SARS-CoV-2.

Janet Woodcock, the acting commissioner of the US Food and Drug Administration, speaks with NPR about SARS-CoV-2 testing and vaccines in the US.

In Science this week: genetic study of kidney fibrosis implicates the SOX9-NAV3-YAP1 axis.