The emergence of viruses as causes of chronic neurological diseases.
D000818:Animals; D002908:Chronic Disease; D006801:Humans; D008457:Measles / Q000150:complications; D009422:Nervous System Diseases / Q000209:etiology*; D013344:Subacute Sclerosing Panencephalitis / Q000209:etiology; D014777:Virus Diseases / Q000150:complications*