Well, here I go, descending into thread creep on my own thread, but it's for an educational purpose. 5th Disease was discovered about 100 years ago. It was the "5th" of the childhood illnesses associated w/ a rash--measles, German measles, chicken pox, & scarlet fever preceding it. It is viral & has some interesting symptoms. Not usually very serious, but, in adults, after-effects can stay w/ you for months or years. Hope I don't get those!

bbc