Dr. Forest Arnold worries about the growing menace of CRE — a deadly superbug that preys on hospitalized patients and kills about half who get bloodstream infections. "We haven't seen much here, but I'm sure it's coming," said Arnold, an epidemiologist at University of Louisville Hospital and an associate professor of infectious diseases at U of L. A study in the August issue of the journal Infection Control and Hospital Epidemiology shows cases of the antibiotic-resistant superbug rose fivefold in community hospitals in the Southeastern United States from 2008 to 2012.