Puerto Rico resident Michelle Flandez caresses her two-month-old son Inti Perez, diagnosed with microcephaly linked to the mosquito-borne Zika virus. The U.S. Centers for Disease Control and Prevention says the Zika virus continues to impact a small number of pregnant women and their babies in the U.S. Carlos Giusti/AP hide caption

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Carlos Giusti/AP

A family member holds twins Eloisa (left) and Eloa, both 8 months old and born with microcephaly, during a Christmas gathering. The mother of the twins, Raquel, who lives in Brazil, said she contracted Zika during her pregnancy. Mario Tama/Getty Images hide caption

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Yalieth Gonzalez and her baby Micaela Delgado at the Maternal Infant Studies Center at the University of Puerto Rico. Marisa Penaloza/NPR hide caption

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Marisa Penaloza/NPR

Living With Zika In Puerto Rico Means Watching, Waiting And Fearing Judgment

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Andie Vaught grasps a stress toy in the shape of a truck as she prepares to have blood drawn as part of a clinical trial for a Zika vaccine at the National Institutes of Health in Bethesda, Md., in November 2016. Allison Shelley/The Washington Post/Getty Images hide caption

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From left: A scene from the video of a car crash test; illustration of a mosquito transmitting the Zika virus; a menstrual shed in Nepal. Insurance Institute for Highway Safety/YouTube; BSIP/UIG via Getty Images; Poulomi Basu/Magnum Emergency Fund hide caption

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Insurance Institute for Highway Safety/YouTube; BSIP/UIG via Getty Images; Poulomi Basu/Magnum Emergency Fund

No one is sure why the northeastern part of Brazil has been hit so hard with microcephaly cases. Felipe Dana/AP hide caption

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Felipe Dana/AP

How Dangerous Is Zika For Babies, Really?

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Florida Department of Health workers package a urine test, part of the state's effort to provide free Zika tests to pregnant women. Joe Raedle/Getty Images hide caption

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A mother holds her baby, who has microcephaly, in Recife, Brazil. Mario Tama/Getty Images hide caption

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Zika No Longer Global 'Health Emergency,' WHO Declares

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A government worker sprays mosquito insecticide fog in Kuala Lumpur, Malaysia, earlier this month to block the spread of Zika. The U.S. CDC advises pregnant women to reconsider plans to travel to Malaysia and 10 other countries because of the virus. Joshua Paul/AP hide caption

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Joshua Paul/AP

Pregnant Women Should Consider Not Traveling To Southeast Asia

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A pest control worker fumigates a school classroom in Kuala Lumpur on Sept. 4. Malaysia reported its first locally transmitted Zika case on Sept. 3. Mohd Rasfan /AFP/Getty Images hide caption

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Mohd Rasfan /AFP/Getty Images

Does Asia Have A Secret Weapon Against Zika?

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Maudeline Orelien, 22, with her son, Wilguens Pierre, who was born in July with microcephaly. Jason Beaubien/NPR hide caption

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Jason Beaubien/NPR

Why The Low Zika Numbers In Haiti Might Be Wrong

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Chinashama Sainvilus is one of three babies born with microcephaly at the Mirebalais Hospital in Haiti in July. Jason Beaubien/NPR hide caption

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Jason Beaubien/NPR

Doctors Fear Zika Is A Sleeping Giant In Haiti

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Twin girls born with extremely small heads, shrunken spinal cords and extra folds of skin around the skull. Scientists think this skin forms when the skull collapses onto itself after the brain —€” but not the skull —€” stops growing. The images of the girls' heads were constructed on the computer using CT scans taken shortly after birth. The girls were infected with Zika at 9 weeks gestation. Courtesy of the Radiological Society of North America hide caption

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Courtesy of the Radiological Society of North America

A plane sprays pesticide over the Wynwood neighborhood of Miami on Aug. 6. That's just one way health officials are battling back Zika-carrying mosquitoes in the area. Joe Raedle/Getty Images hide caption

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How Big, Really, Is The Zika Outbreak In Florida?

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