I also had a mystery virus for months when I was about three years old. The doctors back then pumped me full of antibiotics, which of course don’t kill a virus. We lived in Boston at the time and I saw a new doctor. Way back then in the 60s he was telling people that antibiotics don’t kill viruses. That was kind of a new idea back then. But anyway, I was sick for months and no one has ever figured out what it was.