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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These are insect cells infected with the Guaico Culex virus. The different colors denote cells infected with different pieces of the virus. Only the brown-colored cells are infectious, because they contain the complete virus. Michael Lindquist/Cell Press hide caption

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Michael Lindquist/Cell Press

Surgeon General Vivek Murthy looks at a sample of mosquitoes in Orlando, Fla., on Monday. With him is Department of Health and Human Services Secretary Sylvia Burwell and Orange County Mayor Teresa Jacobs. John Raoux/AP hide caption

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By hanging a caged chicken near mosquito traps in bedrooms in three Ethiopian villages, researchers hoped to learn how the insects react to the scent of a fowl. Kassahun Jaleta/Courtesy of Rickard Ignell hide caption

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Kassahun Jaleta/Courtesy of Rickard Ignell

People walk past graffiti art in the Providencia community of Rio, a favela that dates back to 1897. Mario Tama/Getty Images hide caption

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Is The Risk Of Catching Zika Greater In Poor Neighborhoods?

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A common house mosquito (Culex pipiens) is about to sink her six-weaponed proboscis into a human arm. This type transmits West Nile virus by biting infected birds, then biting humans. Josh Cassidy/KQED hide caption

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Josh Cassidy/KQED

Mosquitoes in traps are transported back to the county's laboratory for analysis. Carrie Feibel/Houston Public Media hide caption

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Carrie Feibel/Houston Public Media

Mosquito Hunters Set Traps Across Houston, Search for Signs of Zika

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A scientist examines mosquitoes at the lab. Walter Reed Army Institute of Research hide caption

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Walter Reed Army Institute of Research

Volunteers Who Say 'Bite Me' Are Helping To Win The War Vs. Mosquitoes

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Mosquito larvae fill the cup of stale water that entomologist Luis Hernandez dips from a stack of old tires in a suburb of San Juan, Puerto Rico. Greg Allen/NPR hide caption

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Puerto Rico Races To Stop Zika's Mosquitoes Before Rains Begin

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Matthew Twombly for NPR

This Mosquito Likes Us Too Much For Our Own Good

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A city health worker and a Brazilian soldier point out potential breeding grounds for mosquitoes in the city of Recife. Mario Tama/Getty Images hide caption

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Brazilians Have To Learn To Think Like A Mosquito

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Sporadic dengue fever outbreaks in Florida in 2009 and 2010 spurred mosquito control efforts in Key West and Miami Beach, shown here. The same mosquito that carries dengue, Aedes aegypti, can transmit Zika. Joe Raedle/Getty Images hide caption

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Florida Governor Ramps Up Mosquito Fight To Stay Ahead Of Zika

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A patient suffering from Guillain-Barre syndrome recovers in a hospital ward in San Salvador on Jan. 27. Researchers are trying to determine whether there is a link between the disorder, which can cause weakness and paralysis, and the mosquito-borne Zika virus. Marvin Recinos /AFP/Getty Images hide caption

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Marvin Recinos /AFP/Getty Images

CDC Sees Major Challenges Ahead In The Fight Against Zika

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Dr. Margaret Chan is director-general of the World Health Organization. In her first major address on Zika, delivered Thursday in Geneva, she said: "Questions abound. We need to get some answers quickly." Sandro Campardo//epa/Corbis hide caption

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Sandro Campardo//epa/Corbis