Communication among health care facilities key to preventing spread of drug-resistant bacteria

The OSU/OHSU College of Pharmacy teamed with the Oregon Health Authority and other collaborators on a two-year study of Acinetobacter baumannii, an opportunistic pathogen associated primarily with infections among patients who have compromised immune systems and are in health care facilities.

Looking at multiple sites in the Pacific Northwest, the scientists identified 21 cases, including 16 isolates of A. baumannii that contained a rare gene responsible for resistance to the carbapenem class of antibiotics.

The patients' transfer history among the studied facilities and the isolates' genetic profiles illustrated how the organism spread from place to place, aided by a lack of interfacility communication that patients who were infected or colonized by A. baummanii were being transferred.

Jon Furuno, co-author on the study and an associate professor in the College of Pharmacy, noted that the findings support a recent Oregon law requiring written notification from the discharging facility to the receiving facility anytime a patient carrying a multridrug-resistant organism, or other infection requiring transmission precautions, is transferred.

Extensively drug-resistant A. baumannii can contain many antibiotic resistance genes that can be transmitted to other organisms, he added.

"It just makes sense that you would want to alert a receiving facility if patients have a specific drug-resistant organism," Furuno said. "The discharging facility needs to include that information with the discharge summary or somewhere on the chart, and the receiving facility needs to know where to look for it."

The lead author is Genevieve Buser, a pediatric infectious disease specialist who worked as a Centers for Disease Control and Prevention Epidemic Intelligence Service officer based at the Oregon Health Authority when the study was done. Buser said communication can ensure appropriate contact precautions are taken.

"An entire chain of transmission can be prevented if staff at a receiving facility know about a patient's multridrug-resistant organism status," Buser said. "This outbreak might not have been identified if not for a new, limited, voluntary surveillance system in Oregon and an astute infection preventionist."

Reporting of extensively drug-resistant A. baumannii infection is not required by most public health jurisdictions in the United States, and clinical laboratories generally do not test for an organism's underlying genetic resistance mechanisms.

Other organizations collaborating on this research included the VA Portland Health Care System; the Division of Infectious Diseases at Oregon Health & Science University; the Oregon State Public Health Laboratory; the Louis Stokes Cleveland VA Medical Center; and Case Western Reserve University.

The CDC and the National Institutes of Health supported the study. Findings were recently published in Infection Control & Hospital Epidemiology.