U.S. Researchers Estimate Range of Microcephaly Risk From Zika Infection

Mosquito
An edes aegypti mosquito is seen inside a test tube as part of a research on preventing the spread of the Zika virus and other mosquito-borne diseases at a control and prevention center in Guadalupe, neighbouring Monterrey, Mexico, in this March 8, 2016 file photo. REUTERS/Daniel Becerril/Files

U.S. researchers are estimating a wide range of potential risk for the birth defect microcephaly following Zika infection in the mother, putting the figure at anywhere between 1 percent and 13 percent, according to newly-released findings.

Their findings are based on statistics from a 2013 Zika outbreak in French Polynesia and ongoing reports of the virus and birth defects in Brazil's Bahia state during the current outbreak.

The analysis was conducted by the U.S. Centers for Disease Control and Prevention and published late Wednesday in the New England Journal of Medicine.

Microcephaly is a rare birth defect marked by unusually small heads and can cause developmental problems. Brazil's Ministry of Health has confirmed 1,434 cases of microcephaly that it believes are related to Zika infection throughout the country, according to data released this week.

The CDC researchers said the highest potential risk for microcephaly appears to be when the mother is infected during the first three months of pregnancy, after which the risk was greatly reduced.

Zika is carried by mosquitoes, which transmit the virus to humans. It can also be transmitted through unprotected sex with an infected man.

"We found a strong association between the risk of microcephaly and infection risk in the first trimester and a negligible association in the second and third trimesters," the report said.

The analysis found the risk of having a baby with microcephaly in the French Polynesia outbreak was 1 percent. But in Brazil, where the outbreak is far more widespread, that is likely to be higher and the alarming numbers of cases of severe microcephaly have surprised experts.

CDC researchers, however, noted several limitations of the report.

It said the available data are very limited, especially in recently affected areas such as Bahia, where total infection rates are unknown and microcephaly cases are still being reported and evaluated.

In addition, most people infected with Zika show no symptoms, meaning little is known about the effects of mild or asymptomatic infections very early in pregnancy, when women may be unaware they are pregnant.

They also cautioned that microcephaly may be just one of a range of potential problems with fetal development that are linked to Zika.

"In light of the growing evidence, it is prudent to take precautions to avoid Zika virus infection during pregnancy and for healthcare systems to prepare for an increased burden of adverse pregnancy outcomes in the coming years," the report concluded.

    Most Popular
  • Is 'The Last Supper' worth watching? Audience and critics weigh in

    Is 'The Last Supper' worth watching? Audience and critics weigh in

    Faith-based films often receive mixed reactions, and The Last Supper is no exception. The movie attempts to bring a fresh perspective to one of the most iconic moments in Christian history, but does it succeed? Some reviews from critics and audiences provide insight into its strengths and shortcomings.

  • ‘The Chosen’ Season 5: The darkest season yet—What to know before watching

    The wait is over—The Chosen is back with its fifth season, and this time, things are getting intense. The new episodes dive straight into the final days of Jesus’ life, covering some of the most emotional and dramatic moments in the Bible. If you’ve been following the series, you already know that The Chosen isn’t just about retelling familiar stories—it’s about bringing them to life in a way that feels real.

  • Massacres in Syria: Over 1,000 dead, including Christians and Alawites

    Syria’s coastal regions have been devastated by a series of massacres, with reports indicating that over 1,000 people—many from Christian and Alawite communities—have been killed in brutal attacks. Entire families have been wiped out, and survivors are fleeing in search of safety as sectarian violence escalates.

  • Kim Sae-ron and Wheesung: The tragic irony of Korean society and the principles of happiness

    Not long ago, the media was in an uproar over actress Kim Sae-ron’s passing. Just months before, the same people who had relentlessly criticized her for her DUI incident were now expressing sympathy, saying, "The world was too harsh on her." The irony is impossible to ignore.

  • Newsboys move forward as a quartet after Michael Tait’s departure

    After more than a decade as the lead singer of the Newsboys, Michael Tait has officially parted ways with the band, marking a significant shift in the Christian rock group’s lineup. The remaining members—Jeff Frankenstein, Jody Davis, Duncan Phillips, and Adam Agee—have assured fans that they will continue forward, embracing a new season of music and ministry.