Fifth's Disease and Pregnancy

An expectant mother is worried that her pregnancy may be at risk because her son has Fifth's disease.
Fifth's Disease
My son had red cheeks for two days. I was told it might be Fifth's disease. I was also told that it is harmful for pregnant women and I am seven months pregnant. He has no other symptoms and I don't know what I should do.
Fifth's disease is a viral illness that is caused by Parvovirus. The usual symptoms of an infection with Parvovirus are mild fever, some malaise, muscle aches and possibly headaches, and then approximately seven or ten days later a rash develops which is a bright red facial rash on both cheeks. This is sometimes referred to as a "slapped-cheek" appearance because the cheeks are so bright red. Some children will also have a rash on their arms and legs that comes and goes. However, there are also some people who don't really have many symptoms other than signs of a slight cold.

It is true that there is a possible risk to the fetus if a woman is infected with Parvovirus during the pregnancy, however, this risk is very, very low. First of all, this risk is higher in the first half of the pregnancy than in the second half of the pregnancy. The other thing to keep in mind is that the majority of adults already have had Parvovirus or been exposed to it, and thus have developed antibodies to it and will not get it again. Thus more than half of pregnant women are not even susceptible to it.

Thus it is very unlikely that you will have any problem if your child does indeed end up having Fifth's disease. The other thing that you should know is that by the time the red rash on the face develops, the child is no longer contagious. Therefore it does not make sense to try and stay away from your son at this point or to prevent his exposure to other people. You should talk with your obstetrician in order to determine if she would like to do any further studies to verify that the baby is doing fine.

Shari Nethersole is a physician at Children's Hospital, Boston, and an instructor in Pediatrics at Harvard Medical School. She graduated from Yale University and Harvard Medical School, and did her internship and residency at Children's Hospital, Boston. As a pediatrician, she tries to work with parents to identify and address their concerns.

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