Microcephaly only part of Zika birth defect problem

Baby with microcephaly – Google free images
Baby with microcephaly – Google free images

More federal money is finally available to fight Zika even as the news worsens. Babies who at first seem to have escaped the virus's devastating hallmark defect — an abnormally small head at birth — might not be out of the woods after all.

Long list of abnormalities

Brazilian doctors have counted a small number of babies who at birth had a normal-sized head and only later were found to have problems. They have delayed neurodevelopment. At 5 months, one could use one hand but not the other. Later on, some even developed microcephaly, where the brain and skull stopped growing properly after birth, instead of before.

"Microcephaly is only the tip of the iceberg, only the thing we see when the baby is born," Dr Vanessa Van der Linden, a paediatric neurologist in Recife, Brazil, told a meeting at the National Institutes of Health where she outlined a long list of Zika-related abnormalities.

To children's health experts the message is clear. Intense study is needed of babies born to Zika-infected mothers to learn the range of health problems they may face.

Read: Zika virus infection may harm adult brain

"It is just critical to evaluate the entire child. Even in the child who does not have microcephaly, that doesn't mean no evaluation is needed," said Dr Catherine Spong of the NIH's National Institute of Child Health and Human Development, which, despite budget constraints, has begun research to better understand the risk to babies.

After months of partisan bickering, Congress last week passed a budget bill that includes $1.1 billion to address the Zika crisis. It's just over half the total emergency money that President Barack Obama requested last February.

Government 'raids' funds

While mosquito season is winding down in parts of this country, Zika's threat here and abroad is not diminishing, and that's why health officials say a sustained commitment is vital.

There are more than 2,200 pregnant women among the 25,600-plus Zika cases that the Centres for Disease Control and Prevention counts in US states and territories, mainly in Puerto Rico. The vast majority of mainland infections are travel-related, but mosquitoes have been spreading Zika in Florida's Miami-Dade County.

Out of money over the spring and summer, the government had raided funds meant for other diseases — Ebola, malaria, tuberculosis, even cancer and heart disease — to research and fight Zika. The new cash infusion will go to mosquito control, other public health measures and research.

Read: Years before Zika vaccine becomes available

At the top of the list is keeping development of a Zika vaccine on track. An initial safety study of an early vaccine candidate is nearly two-thirds enrolled, and Dr Anthony Fauci, NIH's infectious disease chief, expects a larger study in 2,500 to 5,000 people to test if it works to begin by January.

In continental US, the CDC says 21 babies have been born with defects attributed to Zika, and doctors are looking to colleagues in harder-hit countries to know what to expect. At the recent NIH meeting, Van der Linden catalogued a sobering list of abnormalities in the most severely affected babies at her Brazilian clinic, the ones born with microcephaly — which by itself can't indicate the degree of underlying brain damage.

More subtle health effects

She showed videos of those babies having seizures. They tend to cry nonstop. They may not eat enough — only about an ounce of milk at a time — because of painful reflux and trouble swallowing. Their muscles are stiff and spastic. They have vision and hearing problems.

If that isn't worrisome enough, Van der Linden then highlighted less severe problems that appeared later among about a dozen babies who'd appeared healthy at birth, and Dr Carmen Zorrilla of the University of Puerto Rico added that she's seen eye problems among a handful of babies born without microcephaly.

Read: Tens of thousands of babies may be born with Zika disorders

How many babies might be at risk from Zika? How long will they need to be monitored for health problems?

NIH's child health agency has begun a study to try to tell. In areas where Zika is spreading, researchers plan to enrol 10,000 women in the first trimester of pregnancy and then track all the babies through the first year of life. Some will have been infected with Zika and some won't, allowing a comparison of resulting health problems.

"I can't say at this moment in time how long do we need to follow these children, because this is new for us," said Spong, who expects eventually to see a wide variety of health effects more subtle than microcephaly. "It's just essential to be able to come up with what these answers are, to be able to help women and families know."

Read more:

Zika brain damage may also occur in babies with 'normal' heads

Doctors urged to check pregnant women for Zika

10 facts you should know about Zika

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