NGF and viral encephalitis: Abnormal NGF expression and secretion are detected in the body fluids of patients with neurological and psychological disorders, such as viral encephalitis, neurogenic bladder disease, schizophrenia, and Alzheimer’s disease (Turkmen et al. 2021; Rauch et al. 2022; Florentinus-Mefailoski et al. 2021; Homma et al. 2013).