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Leon Evans, director of the community mental health system for Bexar County and San Antonio, broke through barriers that had hindered care. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

Officers Ned Bandoske (left) and Ernest Stevens are part of San Antonio's mental health squad — a six-person unit that answers the frequent emergency calls where mental illness may play a role. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

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Kenyan health officials take the temperatures of passengers arriving at the Nairobi airport on Thursday. Kenya has no reported cases of Ebola, but it's a transportation hub and so is on alert. Simon Maina/AFP/Getty Images hide caption

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An outbreak of bird flu in India in 2008 prompted authorities to temporarily ban the sale of poultry. Diptendu Dutta/AFP/Getty Images hide caption

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First-year medical student Ngabo Nzigira gets ready to see a patient at a Kaiser Permanente facility in Sacramento. Andrew Nixon/Capital Public Radio hide caption

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Television trucks converged on Mount Sinai Hospital in New York on Monday after it announced that it was screening a patient for Ebola virus. Stan Honda/AFP/Getty Images hide caption

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Amber Medel weighs her 3-week-old baby, Elijah, as lactation consultant Carol Chamblin takes note. Medel had problems breast-feeding and Chamblin encouraged her to use a breast pump to get the milk flowing more easily. M. Spencer Green/AP hide caption

itoggle caption M. Spencer Green/AP

A member of Doctors Without Borders dons protective gear in Conakry, Guinea. U.S. health care workers will use similar protective garb. Cellou Binani/AFP/Getty Images hide caption

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Tobacco giant Reynolds American is buying Lorillard and acquiring Newport, a popular menthol cigarette. In a shrinking market, Newport is one of the few U.S. brands gaining market share. It is particularly popular among African-American smokers. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Eduard Egarter-Vigl (left) and Albert Zink (right) sample Italy's mummified iceman for genetic analysis in November 2010. Previous research suggests he, too, was predisposed to heart disease. Samadelli Marco/EURAC hide caption

itoggle caption Samadelli Marco/EURAC

The CDC's director, Tom Frieden, testified before a congressional subcommittee Wednesday regarding a recent anthrax incident and lab safety improvements he is instituting. AFP/Getty Images hide caption

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Particles of H5N1 virus — a particularly dangerous type of bird flu that can infect people — attack lung cells. Chris Bjornberg/Science Source hide caption

itoggle caption Chris Bjornberg/Science Source

Lack of awareness about Ebola has fueled the outbreak in West Africa. Here, two Liberian women in Lofa read a pamphlet about how to prevent the spread of the virus. Ahmed Jallanzo/EPA/Landov hide caption

itoggle caption Ahmed Jallanzo/EPA/Landov

Sick with chikungunya, Karla Sepulveda, 5, waits in a public hospital with her grandmother in Boca Chica, Dominican Republic, on May 15. The Caribbean nation has reported more than 100,000 cases this year. Ezequiel Abiu Lopez/AP hide caption

itoggle caption Ezequiel Abiu Lopez/AP

Helping employees take the time to go for a walk instead of reaching for junk food when energy flags boosts productivity, some firms find. Jamie Grill Photography/Tetra Images/Corbis hide caption

itoggle caption Jamie Grill Photography/Tetra Images/Corbis

Deaths from oxycodone overdoses fell sharply in Florida after the state cracked down on pain clinics and implemented dispensing restrictions. Robin Nelson/Zumapress/Corbis hide caption

itoggle caption Robin Nelson/Zumapress/Corbis