Kamni Vallabh helps her daughter Sonia get ready for her wedding, a few months before Kamni started showing symptoms of the prion disease that would kill her. Courtesy of Sonia Vallabh hide caption

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Courtesy of Sonia Vallabh

A Mother's Early Death Drives Her Daughter To Find A Treatment

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Nursing homes and hospitals need to work harder to keep water systems from being contaminated with bacteria that cause Legionnaires' disease, the CDC says. Getty Images hide caption

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Katherine Streeter for NPR

Handshake-Free Zones Target Spread Of Germs In The Hospital

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A groundskeeper at Pinecrest Gardens sprays pesticide to kill mosquitoes in Miami-Dade County, Fla., in 2016. Gaston De Cardenas/Miami Herald/TNS via Getty Images hide caption

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Gaston De Cardenas/Miami Herald/TNS via Getty Images

Hospital-acquired infections are a big risk in health care, especially for older or seriously ill patients. Dana Neely/Getty Images hide caption

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Dr. Thumbi Mwangi, an infectious disease epidemiologist from Kenya, at Howard Theatre in Washington, DC, on Nov. 29, 2016. In the U.S., Mwangi worked on a vaccine for cows that aimed to combat the same disease he saw the bovine battle in Kenya as a kid. Akash Ghai/for NPR hide caption

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Akash Ghai/for NPR

Fishermen in Papua New Guinea, living on their boats, wait for the tide to change before going out to fish. Tuberculosis is a major health threat in the Pacific Ocean nation. Jason South/The AGE/Fairfax Media via Getty Images hide caption

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Jason South/The AGE/Fairfax Media via Getty Images

Researchers used online data to model the vaccination rate in communities affected by an outbreak of mumps in Arkansas. Maimuna Majumder/HealthMap; Alyson Hurt/NPR hide caption

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Maimuna Majumder/HealthMap; Alyson Hurt/NPR

Tucker Lane and his mother, Lynn Cash, sit in the wooded backyard of his home in West Barnstable, Mass. Kayana Szymczak for NPR hide caption

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Kayana Szymczak for NPR

Beyond Lyme: New Tick-Borne Diseases On The Rise In U.S.

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Pig farm workers push live pigs into a large grave in Nipah in 1999. To stop the outbreak, the Malaysian government culled almost 1 million pigs, nearly destroying the country's pork industry. Andy Wong/AP hide caption

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Andy Wong/AP

A Taste For Pork Helped A Deadly Virus Jump To Humans

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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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Heat and steam from your shower or shave can rob medicine of its potency long before the drug's expiration date. Angela Cappetta/Getty Images hide caption

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Angela Cappetta/Getty Images

When Old Medicine Goes Bad

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