Hey 3kidsmom - Welcome to the Arthritis Forum... sorry for my delay in welcoming you... I do not have any knowledge of the parvovirus and arthritis, however, I did find this:
Adults can and do, in fact, become infected with the virus that causes Fifth disease in children. The virus is called parvovirus.
In children, it causes a lacey or blotchy rash of the trunk and/or extremities and redness of the cheeks that looks like "slapped cheeks." The condition may have associated aching of muscles and joints similar to the flu and usually resolves in days.
In adults, the flu-like symptoms are often more severe and the condition is called parvovirus infection, not Fifth disease. They typically do not get a rash of the face, but can have the lacey rash of the body. Joint pains are common when adults get parvovirus. The joint pain usually resolves in weeks, but 10% of patients can have a more prolonged arthritis that does mimic rheumatoid arthritis. The rheumatoid factor blood test is usually negative, but can be positive. The treatment involves medications that reduce inflammation in the joints.
Parvovirus is very contagious. One a person is infected, they become immune to further infection. The virus can be diagnosed by blood testing for parvovirus B19 antibodies.
I also read that a lot of times parvovirus arthritis gets mistaken for lyme's... Interesting stuff.. Please let us know how you are doin.. Duck