The association of rubella virus in congenital cataract - a hospital-based study in India.

BACKGROUND

The association of rubella virus (RV) with congenital cataract has been well established. Since the data on association of RV with congenital cataract in India are scanty, a study was done based on virus isolation from lens aspirates in patients undergoing therapeutic lensectomy and serology.

OBJECTIVE

To determine the incidence of the association of rubella virus with congenital cataract.

STUDY DESIGN

The lens aspirates collected during the 9-year period (from 1990 to 1998), from 70 children up to 12 years of age with congenital cataract were processed for the isolation of rubella virus by conventional viral isolation culture method using BHK-21 and Vero cell lines. Identification of the virus was confirmed by immunofluorescence using human anti-rubella virus specific hyperimmune serum. Serum samples were collected from 55 out of these 70 children and the presence of antibodies to RV was detected by ELISA test.

RESULTS

RV was isolated from lens aspirates in seven (10%) out of the 70 children with congenital cataract. Of the 55 sera tested, 22 had both anti-rubella IgM and IgG antibodies, in 13 only anti-RV IgG antibodies, in seven only IgM antibodies and the rest of the 13 samples did not have detectable levels of rubella antibodies. Among the children who had IgM antibodies, 12 (24.5%) were below the age of 6 months.

CONCLUSION

It can be concluded based on virus isolation that 10% of patients with congenital cataract were due to rubella infection and the detection of 24.5% anti-RV IgM antibodies in children below 6 months old shows the possible association of rubella virus with congenital cataract.