If my child was diagnosed with fifth disease, do I need to keep her out of daycare or school?

No. The diagnosis of fifth's disease is made from the classic appearance of the rash, which usually causes very red cheeks with a more "lacy" appearing rash on the arms and thighs. Once your child has the rash, they are no longer contagious. However, fifth's can be a problem for pregnant women in the first trimester, and if your child was around anyone who is or might be pregnant, please notify them.
No. Once the rash appears and the diagnosis can be made, these kids are not contagious.