MAPT and Alzheimer disease: Second, we prioritized screening the five most common types of disease and detected specific indexes, such as CSF tau/14-3-3 protein and EEG for CJD, CSF or positron emission tomography (PET) AD markers for AD, CO hemoglobin concentration for CO poisoning, CSF treponemal antibodies for neurosyphilis, myocardial scintigraphy, polysomnography, FDG-PET or DAT-PET for DLB, and further genetic testing if necessary.