Human herpesvirus 6 or HHV-6, is a herpes virus just like Epstein-Barr Virus, Cytomegalovirus, Chicken pox (varicella zoster), HHV-7, HHV-8 and Herpes simplex 1 and 2. There are two types of this virus including HHV-6A and HHV-6B. 100% of human beings get infected with HHV-6B by the age of three which results in fever, diarrhea and a rash called roseola. In rare cases it can cause seizures and encephalitis. There are many infection connections to autoimmune diseases like Hashimoto’s disease and in this article I’ll cover the connection between HHV-6 and Hashimoto’s disease.