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Community-acquired MRSA cases on the rise in New York City, study suggests

Hospitalization rates in New York City for patients with community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA), a potentially deadly bacterial infection that is resistant to antibiotic treatment, more than tripled between 1997 and 2006, according to a report published in the July issue of Infection Control and Hospital Epidemiology, the journal of the Society for Healthcare Epidemiology of America.

Most cases of MRSA are acquired in hospitals, nursing homes, or other healthcare facilities. But in recent years public health experts have become increasingly concerned about MRSA infections acquired in community settings like homes, schools, and neighborhoods.

During the study period 3,579 people were admitted to New York City hospitals with CA-MRSA. The rate of CA-MRSA increased from 113 people in 1997, a rate of about 1.5 cases per 100,000 people, to 875 admissions in 2006, a rate of 5.3 per 100,000. Overall, about 20 percent of all MRSA hospitalizations over the study period were community acquired, the study found.

"These findings suggest a substantial increase in the rate of hospitalization with community-acquired MRSA in New York City since 1997," said Amanda Farr, MPH, one of the study's authors. This research was done in collaboration between the New York City Department of Health and Mental Hygiene and Columbia University's Mailman School of Public Health.

When compared with other hospitalizations in the study period, researchers noted that men, children, people with diabetes, people with HIV, and the homeless were more likely to be hospitalized with CA-MRSA than the general population. Residents of the Bronx also had substantially higher rates of CA-MRSA hospitalization than those of other New York City boroughs, likely impacted by a lack of access to primary care health services.

The authors speculated at the increased risk associated with these demographics and co-morbidities. Skin infections and sores are common among people with HIV and diabetes and could open the door to MRSA infection. Males and children may be at higher risk because they are more likely to play contact sports, which are associated with an increase risk of spreading bacteria. Persons that are homeless may have limited access to healthcare, as well as have other risk factors such as lack of personal hygiene and sharing personal items in shelter settings.

The findings suggest that public health efforts to curb community-acquired MRSA should be targeted to high-risk groups.

"Departments of health should educate homeless shelters about CA-MRSA, ways to recognize exposures that lead to transmission and signs and symptoms that should prompt people to seek medical care," the researchers write. "Programs to increase awareness are also needed in the Bronx and other high-risk areas to help residents and healthcare providers recognize signs and symptoms of early infection and implement prompt treatment as well as conduct proper wound care, especially in HIV-positive persons and those with diabetes."

The study reviewed administrative data submitted to New York State Department of Health's Statewide Planning and Research Cooperative System, a reporting system established in 1979 as a result of cooperation between the healthcare industry and government.

Amanda M. Farr, Brandon Aden, Don Weiss, Denis Nash, and Melissa A. Marx, "Trends in Hospitalization for Community-Associated Methicillin-Resistant Staphylococcus aureus in New York City, 1997-2006: Data from New York State's Statewide Planning and Research Cooperative System." Infection Control and Hospital Epidemiology 33:7 (July 2012).

Published through a partnership between the Society for Healthcare Epidemiology of America and The University of Chicago Press, Infection Control and Hospital Epidemiology provides original, peer-reviewed scientific articles for anyone involved with an infection control or epidemiology program in a hospital or healthcare facility. ICHE is ranked 15 out of 140 journals in its discipline in the latest Journal Citation Reports from Thomson Reuters.

SHEA is a professional society representing more than 2,000 physicians and other healthcare professionals around the world with expertise in healthcare epidemiology and infection prevention and control. SHEA's mission is to prevent and control healthcare-associated infections and advance the field of healthcare epidemiology. The society leads this field by promoting science and research and providing high-quality education and training in epidemiologic methods and prevention strategies. SHEA upholds the value and critical contributions of healthcare epidemiology to improving patient care and healthcare worker safety in all healthcare settings. Visit SHEA online at, on Twitter @SHEA_Epi and Facebook at

Tamara Moore | EurekAlert!
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