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Intrauterine rubella, head size, and intellect.

D W Macfarlane, R D Boyd, C B Dodrill

|June 1, 1975

Summary

Congenital rubella infection does not always cause microcephaly or intellectual disability. This study found average IQs in children with intrauterine rubella, suggesting they are small children, not necessarily intellectually impaired.

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Area of Science:

Pediatrics
Neurology
Infectious Diseases

Background:

Congenital rubella syndrome (CRS) is often presumed to cause microcephaly and intellectual disability.
Previous assumptions may lead to misdiagnosis and inadequate support for affected children.

Purpose of the Study:

To investigate the association between congenital rubella infection and microcephaly.
To assess the intellectual capacity of children with intrauterine rubella exposure.

Main Methods:

Evaluated 111 children from a rubella clinic.
Administered the Leiter International Scale to 92 children with sufficient vision.
Measured head circumference and correlated it with stature and intellect.

Main Results:

The mean IQ of the tested group was 99.46 (SD, 19.5), indicating average intellectual ability.
Head circumference showed a strong correlation with stature but a weak correlation with intellect.
Microcephaly was not a consistent finding, nor was intellectual disability.

Conclusions:

Children with intrauterine rubella should be recognized as generally small, not necessarily having small heads.
Assuming mental subnormality without thorough assessment can disadvantage children with congenital rubella.
Further research is needed to fully understand the spectrum of neurodevelopmental outcomes in CRS.

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