Exposed children need continued evaluation
Interpreting the clinical implications of available studies is also challenging. It can be difficult to distinguish between central nervous system damage and peripheral damage, leaving the true etiology of poor vision or hearing elusive. The Zika virus can attack both the optic nerve and the part of the brain that interprets what a person sees: “Are you not seeing well because that part of your brain is not developed, or is it just a problem with the eye?” Dr. Nielsen said.
When problems can’t be precisely identified, successful interventions are harder. If the cochlea is normal, for instance, but the part of the brain that interprets sound or language has deficits, a hearing aid won’t help.
The services and interventions that children need depend on their specific developmental or cognitive deficits, regardless of the cause. But if clinicians know the cause is likely Zika exposure, they also know to look for other deficits.
Children showing likely effects of congenital Zika infection should be further evaluated for other possible birth defects and referred to a developmental specialist, early intervention services, and family support services. Depending on the child, primary care providers might consider referrals to an infectious disease specialist, clinical geneticist, neurologist, or other specialists.
Even with no confirmed infection or visible signs at birth, clinicians should remain vigilant with children who had possible exposure. A recently published study of 120 children conceived during the Zika outbreak in Paraíba, Brazil, assessed as infants and then again at 2 years old, exemplifies why. Researchers identified adverse neurologic outcomes and developmental delays in several children who had no physical evidence of birth defects as newborns, but whose antibody tests showed possible infection.
“In this post-epidemic period, with decreased Zika transmission and less public awareness,” wrote Dr. Mulkey and a colleague, “follow-up of these children is now more important than ever”.
A version of this article originally appeared on Medscape.com.