I've just heard of this disease, it's running rampant in several states. Here are some facts. From: http://www.nlm.nih.gov/medlineplus/ency/article/000977.htm

Alternative names Return to top
Parvovirus B19; Erythema infectiosum; Slapped cheek

Definition Return to top
Fifth disease is an illness caused by a virus that leads to a rash on the cheeks, arms, and legs.
Causes, incidence, and risk factors Return to top
Fifth disease is caused by human parvovirus B19. It often affects preschoolers or school-age children during the spring. The disease is spread by contact with respiratory secretions and usually lasts for 5 days. However, the rash associated with fifth disease may return for several weeks. Return of the rash may be brought on by sunlight, heat, exercise, fever, or emotional stress.

The first sign of the disease is usually bright red cheeks, which look as though the child has been recently slapped on both sides of the face. Following this, a rash appears on the arms and legs and middle of the body. The rash fades from the center outwards, giving it a lacy appearance. Over a period of 1 to 2 weeks, the rash completely goes away.
Fifth disease is also sometimes associated with fever.

If a pregnant woman becomes infected with parvovirus B19, it can cause significant harm to her unborn baby. Any pregnant woman who believes that she may have been in contact with a person who has this virus should talk to her health care provider.
Parvovirus B19 is also thought to cause other diseases, including an infectious form of arthritis.
The majority of adults seem to have antibodies to parvovirus B19 in their bodies. This indicates that most people have been exposed to the virus, and also suggests that many infections go unnoticed.

Symptoms include:

Symptoms Return to top
Rash
First appears on the cheeks, often looks like "slapped cheeks"
Spreads to the arms and legs about 1 day later, often has a "lacy" appearance
Fever

Joint pain
Temporary anemia -- this is only serious if the patient has a immune system problem and some other, existing form of anemia

Treatment Return to top
No treatment is usually required for fifth disease in children. If fever or joint discomfort is present then oral acetaminophen (such as Tylenol) may be given.

Expectations (prognosis) Return to top
Since this is a mild and generally benign viral infection, complete recovery can be expected.

Complications Return to top
There are generally no complications in normally healthy children.

Calling your health care provider Return to top
Call your health care provider if symptoms suggestive of fifth disease develop (to rule out other disorders that could be causing the symptoms).
The reason for doing this is I just got an email from someone saying their young cousin has it.
A friend of mine in Washington said that it's going around there like wildfire, and it's here too. I'd never heard of it before and I thought it would be a good topic to blog about, you know, get the info out. Hope it helps some of you.
S