Parvovirus B19

Parvovirus B19 is single-stranded DNA virus that causes the common childhood illness, erythema infectiosum, also called Fifth disease. The illness typically presents with a characteristic red rash on the child's cheeks ("slapped cheek" rash), fever, headache, and runny nose. The rash may spread to other areas of the body. Duration is 7-10 days. Adults who become infected may develop painful or swollen joints (polyarthropathy syndrome) which usually resolves in several weeks.

Parvovirus B19 infections in people with weakened immune systems cause result in serious complications, such as anemia. It, also, poses a potentially serious risk for miscarriage, stillbirth, and fetal health complications if infection occurs when pregnant.

Dr. John Chia, an infectious disease specialist, has listed parvovirus B19 as one of the viruses that may trigger chronic fatigue syndrome in a subset of patients.

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 * Wikipedia