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Coronaviruses can cause a mild cold or severe pneumonia-like symptoms. Dr. Gopal Murti/Visuals Unlimited/Corbis hide caption

itoggle caption Dr. Gopal Murti/Visuals Unlimited/Corbis

Drama ensues when doctors work to save patients bleeding from traumatic injuries. Ian Roberts hide caption

itoggle caption Ian Roberts

Who's there? A radiologist studies digital X-rays in a viewing room at what is now called the Walter Reed National Military Medical Center in Bethesda, Md. Seth Rossman/U.S. Navy hide caption

itoggle caption Seth Rossman/U.S. Navy

United Nations Aids Executive Director Michel Sibide hugs Secretary of State Hillary Clinton after they they presented the a road map for stopping HIV around the world. Jim Watson/AFP/Getty Images hide caption

itoggle caption Jim Watson/AFP/Getty Images

Keith Gresham, 65, lines up four medications he takes at his home in Detroit in 2011. The self-employed painter was without health insurance for about a decade and was happy to finally turn 65 last year so he could qualify for Medicare. Patricia Beck/MCT/Landov hide caption

itoggle caption Patricia Beck/MCT/Landov

Scientists say that the best way to reduce a person's contact with the flame retardant chemicals in sofas and other furniture is to vacuum more. SINAN DONMEZ/iStockphoto.com hide caption

itoggle caption SINAN DONMEZ/iStockphoto.com

At a Los Angeles media briefing in 2010, Mariah Bianchi describes how her own case of whooping cough caused the death of her newborn son. Reed Saxon/AP hide caption

itoggle caption Reed Saxon/AP

An artistic model of a coronavirus infecting a cell. The family of viruses can cause mild infections, like the common cold, and severe pneumonia-like infections, such as SARS. Peter Kohama/MCT/Landov hide caption

itoggle caption Peter Kohama/MCT/Landov

A young man places an oral swab into a solution to complete an HIV test during a free screening event in Washington, D.C. Brendan Smialowski/Getty Images hide caption

itoggle caption Brendan Smialowski/Getty Images

Grapefruit can make for a tasty addition to breakfast. But it can also interfere with some medications. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Hospitals began testing blood for hepatitis in 1992, so anyone who received a blood transfusion before then is at an increased risk for contracting the disease. iStockphoto hide caption

itoggle caption iStockphoto

Last year, Tom Mather caught 15,000 deer ticks in the woods of southern Rhode Island. "People really need to become tick literate," the University of Rhode Island researcher says. Brian Mullen for NPR hide caption

itoggle caption Brian Mullen for NPR