Apparently it's named Fifths Disease because it's the fifth classical rash-associated infection of childhood. Thankfully, it's not a serious thing, and Emily's not contagious anymore, now that she has the rash, and the other symptoms seem to be gone except for the stuffy nose. Just thought I'd pass along the information for all you moms out there with little ones.
Especially common in kids between the ages of 5 and 15, fifth disease typically produces a distinctive red rash on the face that makes the child appear to have a "slapped cheek." The rash then spreads to the trunk, arms, and legs. Fifth disease is actually just a viral illness that most kids recover from quickly and without complications.
Fifth disease (also called erythema infectiosum) is caused by parvovirus B19. A human virus, parvovirus B19 is not the same parvovirus that veterinarians may be concerned about in pets, especially dogs, and it cannot be passed from humans to animals or vice versa.
Signs and Symptoms
Fifth disease begins with a low-grade fever, headache, and mild cold-like symptoms (a stuffy or runny nose). These symptoms pass, and the illness seems to be gone until a rash appears a few days later. The bright red rash typically begins on the face. Several days later, the rash spreads and red blotches (usually lighter in color) extend down to the trunk, arms, and legs. The rash usually spares the palms of the hands and soles of the feet. As the centers of the blotches begin to clear, the rash takes on a lacy net-like appearance. Kids younger than 10 years old are most likely to get the rash.
A person with parvovirus infection is most contagious before the rash appears — either during the incubation period (the time between infection and the onset of symptoms) or during the time when he or she has only mild respiratory symptoms. Because the rash of fifth disease is due to an immune reaction (a defense response launched by the body against foreign substances like viruses) that occurs after the infection has passed, a child is usually not contagious once the rash appears.
Parvovirus B19 spreads easily from person to person in fluids from the nose, mouth, and throat of someone with the infection, especially through large droplets from coughs and sneezes. http://kidshealth.org/