An official at the University of Michigan Health System in Ann Arbor says its mix of patients helps explain the infection rates. Scott C. Soderberg/Courtesy of University of Michigan Health System hide caption

itoggle caption Scott C. Soderberg/Courtesy of University of Michigan Health System

One rationale for extending Medicaid coverage to more people is to help them get to a doctor or clinic before a minor illness becomes a medical emergency. iStockphoto hide caption

itoggle caption iStockphoto

A sign displaying calorie counts is seen in a Subway restaurant in New York City in 2008. A yet-to-be-finalized federal rule requiring big chain restaurants to post calorie counts has likely led eateries to tweak their menus. Mario Tama/Getty Images hide caption

itoggle caption Mario Tama/Getty Images

In New Jersey in March, Dianna Lopez of the Center for Family Services (right) speaks with Betsy Cruz, of Camden, N.J., about health insurance coverage during an Affordable Care Act information session. Lori M. Nichols/South Jersey Times/Landov hide caption

itoggle caption Lori M. Nichols/South Jersey Times/Landov

Construction is continuing at the Maryland Proton Treatment Center in downtown Baltimore. It's one of three such centers under development in the Washington, D.C., region. Jenny Gold/KHN hide caption

itoggle caption Jenny Gold/KHN

Kevin Wierhs and Susan Johnson confer about what works and what doesn't in managing diabetes. Sarah McCammon/Georgia Public Broadcasting hide caption

itoggle caption Sarah McCammon/Georgia Public Broadcasting

David Combs, an insurance broker in Kentucky, wound up benefiting from the Affordable Care Act, even though early on he had figured the law would put brokers out of business. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

Michael Granillo and his wife Sonia await treatment at an emergency room in Northridge, Calif. Anna Gorman, Kaiser Health News hide caption

itoggle caption Anna Gorman, Kaiser Health News

Eric Bleeker and a partner respond to 911 calls in this vehicle. The medical team can run simple lab tests and prescribe some drugs, which may spare a patient a trip to the ER. Eric Whitney hide caption

itoggle caption Eric Whitney