This 'study' lists the pathogens associated with all the various neurodegenerative or neurobehavioral diseases and is an easy read.
Chronic Bacterial and Viral Infections in Neurodegenerative and Neurobehavioral Diseases
Often, patients with neurodegenerative or neurobehavioral diseases have chronic, neuropathic infections that could be important in disease inception, disease progression, or increasing the types or severities of signs and symptoms. Although controversial, the majority of patients with various neurodegenerative or neurobehavioral conditions, such as amyotrophic lateral sclerosis, multiple sclerosis, Alzheimer's disease, Parkinson's disease, and autistic spectrum disorders, show evidence of central nervous system or systemic bacterial and viral infections.
http://www.medscape....rticle/574944_1