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Will the fetus get infected if the rubella IgM is present in blood?

Q: I am a 27-year-old woman. I got chicken pox and was given Zoviraz and other antibiotics for 5 days from 5 months ago. It was a very mild attack and the rash was only on my stomach, thighs and lower back. I conceived after a month of getting the attack. My doctor advised me to get my rubella counts checked. My IgM levels were within the range and IgG was 64.9, which indicates immunity or a past infection. Is there a chance that my fetus is infected? Should I go ahead with the pregnancy or terminate it? This is my first pregnancy. I have been taking Cifron for a vaginal infection for the past 4 months. Please advise.

A:The diagnosis of rubella is confirmed by serologic (blood) tests). An acute infection is confirmed by a significant rise in rubella antibody titre or by the presence of serum rubella IgM. Blood should be collected as early as possible (within 7–10 days) after onset of illness, and again 14–21 days (minimum of 7) days later. Rubella-specific IgM is found in virtually all infected patients by 3 weeks post development of a rash. Rubella-specific IgM is also found in 80% of post vaccination patients by 3 weeks. Congenitally infected infants will show an IgM response at 2-12 weeks postnatally. Rubella-specific IgM may persist for months after an acute infection and, possibly, after vaccination as well. False-positive IgM tests can be seen in persons with parvovirus infections, with a positive heterophile test for infectious mononucleosis, or with a positive rheumatoid factor. Elevated IgG rubella antibodies indicate a current or previous exposure/immunization to rubella. You should not worry. Get regular ultrasound done and be guided by your obstetrician.


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