The purple-stained Rothia dentocariosa bacteria are frequently found in the human mouth and respiratory tract. CDC hide caption

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Ella Barnes-Williams visits the thrift shop associated with Martha's Table, a nonprofit social services organization in Washington, D.C. Anders Kelto/NPR hide caption

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Dr. Stephen Teach helps Jeffery Ulmer listen to his daughter Alauna's asthmatic breathing at Children's National Medical Center in Washington, D.C. Alauna's mother, Farisa, holds her. The District has one of the highest rates of pediatric asthma in the country. Jahi Chikwendiu/Washington Post hide caption

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Virginia Rady, 28, holds her old nebulizer at her home in Dallas. Rady was diagnosed with chronic persistent asthma at age 2. She underwent a series of three outpatient surgeries between December 2012 and February 2013 for a procedure known as bronchial thermoplasty. She says the procedure has changed her life, allowing her to remove her nebulizer from her bedside. Brandon Thibodeaux for NPR hide caption

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Tapas Mukherjee shot this asthma education video in a field near his home. Tapas Mukherjee/YouTube hide caption

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Sucking may be one of the most beneficial ways to clean a baby's dirty pacifier, a study found hide caption

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Otolaryngologist Sandra Lin uses under-the-tongue drops to treat patients with allergies at Johns Hopkins in Baltimore. Courtesy of Keith Weller/Johns Hopkins Medicine hide caption

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Maria Texeira-Gomes holds a photo of her 5-year-old son, Matheo, who has struggled with asthma nearly all his life. Richard Knox/NPR hide caption

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