2 Answers

The "Fifth disease" , aka- parvovirus B19, is a mild "slapped cheek" rash illness that occurs most commonly in children. The ill child typically has a light red rash on the face and a lacy red rash on their trunk and limbs. Occasionally, the rash may itch. An ill child may have a low-grade fever, malaise, or a "cold" a few days before the rash breaks out. The child is usually not very ill, and the rash resolves in 7 to 10 days.

Yes. A person infected with parvovirus B19 is contagious during the early part of the illness, before the rash appears. By the time a child has the characteristic "slapped cheek" rash of fifth disease, for example, he or she is probably no longer contagious and may return to school or child care center. This contagious period is different than that for many other rash illnesses, such as measles, for which the child is contagious while he or she has the rash.
I hope that answers your question somewhat, Thanks.

I think it is the disease after the fourth, but before the sixth? Just kidding, good answer Raider.
My fourth disease was the mumps, by the way.