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

Nina Pham, shown here in a 2010 college yearbook photo, became infected with Ebola virus while caring for Thomas Eric Duncan in a Dallas hospital. Courtesy of tcu360.com/AP hide caption

itoggle caption Courtesy of tcu360.com/AP

Dr. Wvennie MacDonald, the administrator of the JFK Memorial Hospital, has helped put new procedures in place to keep Ebola out, including a triage station to identify possible Ebola patients at the front gate. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

Ideally, the best place to care for someone ill with Ebola is at the end of a hall in a room with its own bathroom, anteroom and entrance, says Dr. Jack Ross of Hartford Hospital. Jeff Cohen/WNPR hide caption

itoggle caption Jeff Cohen/WNPR

Traffic moves past Texas Health Presbyterian Hospital in Dallas, where a patient showed up with symptoms that were later confirmed to be Ebola. Mike Stone/Getty Images hide caption

itoggle caption Mike Stone/Getty Images

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

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

The headquarters for University of Pittsburgh Medical Center and Highmark Blue Cross/Blue Shield dominate the Pittsburgh skyline much as they organizations have dominated health care in the region for decades. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

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

itoggle caption Stan Honda/AFP/Getty Images

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

itoggle caption Cellou Binani/AFP/Getty Images

Residents fear that the economy of Belhaven, N.C., will collapse because its hospital closed. "How many people go retire somewhere where it doesn't even have a hospital?" asks the mayor. Hyun Namkoong hide caption

itoggle caption Hyun Namkoong

"We can't continue to have unsafe medical care be a regular part of the way we do business in health care," said Harvard School of Public Health's Dr. Ashish Jha at a Senate hearing Thursday. AP hide caption

itoggle caption AP

Keeping patient records electronically, instead of on paper, didn't change how much hospitals charged per procedure, a study shows. But critics say billing errors can be more subtle. Roy Scott/Ikon Images/Corbis hide caption

itoggle caption Roy Scott/Ikon Images/Corbis