Angelica Pereira feeds her daughter Luiza, who was born with microcephaly, at her mother's house in Santa Cruz do Capibaribe, Brazil. Felipe Dana/AP hide caption

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Felipe Dana/AP

Zika Virus Can Cause Brain Defects In Babies, CDC Confirms

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Mylene Helena Ferraira of Recife, Brazil, carries her 5-month-old son, David Henrique Ferreira, who was born with microcephaly. She's returning home after a medical visit. Mario Tama/Getty Images hide caption

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CDC Arrives In Brazil To Investigate Zika Outbreak

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While some scientists seek ways to stop the spread of Zika by mosquitoes, others have received new funding from the National Institutes of Health to track the genes and habits of the virus itself. Felipe Dana/AP hide caption

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Felipe Dana/AP

Virus Profilers Race To Figure Out What Makes Zika Tick

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Aedes aegypti mosquitoes are displayed at an exhibition on Jan. 28 in Brazil. The mosquitoes can be carriers of the Zika virus. Several cases of the virus have spread to Puerto Rico. Mario Tama/Getty Images hide caption

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Puerto Rico Health Official 'Very Concerned' About Zika's Spread

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Nancy Writebol, a missionary who recovered from Ebola she contracted in Liberia in 2014, told a reporter last July that she was still experiencing knee pain and hadn't fully regained her energy. Chris Keane/Getty Images hide caption

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Thomas Kuhlenbeck/Ikon Images/Corbis

Wherever You Go, Your Personal Cloud Of Microbes Follows

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Scientists think the lone star tick (center) likely transmits Heartland disease to people. And the virus probably also circulates in deer and coyotes. iStockphoto; CDC; iStockphoto hide caption

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iStockphoto; CDC; iStockphoto

A blood test developed by Harvard researchers checks for evidence of past infection with more than a thousand strains of virus, from about 200 virus families. The swine flu virus shown here, A/CA/4/09, rarely infects humans. C. S. Goldsmith/CDC hide caption

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C. S. Goldsmith/CDC

How Many Viruses Have Infected You?

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Augustine Goba (right) heads the laboratory at Kenema Government Hospital in Sierra Leone. He and colleagues analyzed the viral genetics in blood samples from 78 Ebola patients early in the epidemic. Stephen Gire/AP hide caption

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Stephen Gire/AP

Could This Virus Be Good For You?

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Biologist Rob Knight, co-founder of the American Gut Project, recently moved the project to the University of California, San Diego's School of Medicine. Casey A. Cass/University of Colorado hide caption

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Casey A. Cass/University of Colorado

Ecologists found signs of Ebola in a Rousettus leschenaultii fruit bat. These bats are widespread across south Asia, from India to China. Kevin Olival/EcoHealth Alliance hide caption

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Kevin Olival/EcoHealth Alliance

Where Could Ebola Strike Next? Scientists Hunt Virus In Asia

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A woman protects her child's face in Managua, Nicaragua, as health workers fumigate for mosquitoes that carry chikungunya. The virus started spreading through Nicaragua and Mexico in the fall. Esteban Felix/AP hide caption

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Esteban Felix/AP

Painful Virus Sweeps Central America, Gains A Toehold In U.S.

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The dengue virus has an icosahedral shape, similar to the pattern on a soccer ball. Antibodies stop the virus by binding to its surface. Laguna Design/Science Source hide caption

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Laguna Design/Science Source