risk of birth defects greater than expected
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Last Updated : GMT 06:49:16
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Zika Update

Risk of Birth Defects Greater Than Expected

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Arab Today, arab today Risk of Birth Defects Greater Than Expected

Zika virus infection may go on to have a baby
Washington - Arab Today

A new study has found that in the U.S., one out of every ten pregnant women with a confirmed Zika virus infection may go on to have a baby with serious birth defects.

The report, published Tuesday by the Centers for Disease Control and Prevention (CDC), analyzes data from the U.S. Zika Pregnancy Registry, a database that epidemiologists have been using to track pregnancy outcomes among Zika-affected women living in the U.S. It is the largest study so far of pregnancy outcomes in American women infected with Zika. 

In all, 1,297 pregnancies from 44 states (excluding Puerto Rico) were reported to the Registry in 2016. Some of the pregnant women were infected by mosquito bites they received in the U.S., but the vast majority of women (including all that resulted in birth defects)  were infected by mosquito bites they received while traveling abroad.

The study authors focused on the 972 pregnancies that were “completed” by the end of 2016 and that had laboratory evidence of Zika virus infection. Of those 972, only 250 had fully confirmed Zika infection (meaning their diagnostic tests clearly showed evidence of the virus); 10% of those pregnancies (24 out of 250) resulted in fetuses or babies with serious birth defects.

For women whose infections were confirmed during the first trimester, that percentage shot up to 15%.

Those percentages mark a 20-30-fold increase in birth defects compared with the usual rate of birth defects in the U.S. But experts say they may still be a gross underestimation of the actual risk: According to data from the registry, just one-fourth of the babies whose mothers showed some evidence of Zika infection during pregnancy received brain imaging tests after they were born.  

The CDC recommends that all such babies receive a head ultrasound or CT within their first year of life, to monitor for brain defects that may not be evident at birth.

For reasons that health officials have yet to determine, doctors and patients have largely ignored that advice. And because those scans weren't done in a majority of cases, it's impossible to say what portion of babies who initially appeared healthy eventually developed problems. 

The report does appear to solve at least one longstanding Zika mystery: The authors note that in their analysis, women who had symptoms of Zika virus infection (including fever, joint and muscle pain and nausea) and women who had no such symptoms, were equally likely to pass the virus on to their fetuses.  

The findings drive home the urgency of remaining vigilant about Zika prevention. The CDC urges women who are pregnant, or who are trying to become pregnant, to avoid traveling to Zika affected countries, to wear an EPA-registered insect repellent, and to take other basic precautions against mosquito bites, such as ridding their yards of standing water. For a more complete list of mosquito-bite prevention tips, see our 2017 Zika update here. And for the bug sprays that best protect against the Zika-carrying Aedes aegypti mosquito, visit our Insect Repellent Buying Guide. 

Source: AFP

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