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Changes in the Molecular Epidemiological Characteristics of Methicillin-Resistant Staphylococcus aureus in a Neonatal Intensive Care Unit

Published online by Cambridge University Press:  02 January 2015

Alison J. Carey ,
Phyllis Della-Latta ,
Richard Huard ,
Fann Wu ,
Phillip L. Graham III ,
Diane Carp  and
Lisa Saiman
Alison J. Carey*
Affiliation:
Department of Pediatrics, Division of Neonatology, Drexel University College of Medicine, St. Christopher's Hospital for Children, Philadelphia, Pennsylvania
Phyllis Della-Latta
Affiliation:
Department of Pathology, New York-Presbyterian Hospital, New York, New York Clinical Microbiology Service, New York-Presbyterian Hospital, New York, New York
Richard Huard
Affiliation:
Department of Pathology, New York-Presbyterian Hospital, New York, New York Clinical Microbiology Service, New York-Presbyterian Hospital, New York, New York
Fann Wu
Affiliation:
Department of Pathology, New York-Presbyterian Hospital, New York, New York Clinical Microbiology Service, New York-Presbyterian Hospital, New York, New York
Phillip L. Graham III
Affiliation:
Morgan Stanley Children's Hospital of New York-Presbyterian, New York-Presbyterian Hospital, New York, New York Department of Pediatrics, Division of Infectious Diseases, New York-Presbyterian Hospital, New York, New York Columbia University, and the Department of Infection Control and Prevention, New York-Presbyterian Hospital, New York, New York
Diane Carp
Affiliation:
Columbia University, and the Department of Infection Control and Prevention, New York-Presbyterian Hospital, New York, New York
Lisa Saiman
Affiliation:
Morgan Stanley Children's Hospital of New York-Presbyterian, New York-Presbyterian Hospital, New York, New York Department of Pediatrics, Division of Infectious Diseases, New York-Presbyterian Hospital, New York, New York Columbia University, and the Department of Infection Control and Prevention, New York-Presbyterian Hospital, New York, New York
*
Division of Neonatology, St. Christopher's Hospital for Children, 3601 A Street, Philadelphia, PA 19134, ([email protected])
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Extract

Objective.

To determine whether the molecular epidemiological characteristics of methicillin-resistant Staphylococcus aureus (MRSA) had changed in a level III neonatal intensive care unit (NICU).

Design.

Retrospective review of medical records.

Setting.

Level III NICU of a university-affiliated children's hospital in New York, New York.

Patients.

Case patients were neonates hospitalized in the NICU who were colonized or infected with MRSA.

Methods.

Rates of colonization and infection with MRSA during the period from 2000 through 2008 were assessed. Staphylococcal chromosomal cassette (SCC) mecA analysis and genotyping for S. aureus encoding protein A (spa) were performed on representative MRSA isolates from each clonal pulsed-field gel electrophoresis pattern.

Results.

Endemic MRSA infection and colonization occurred throughout the study period, which was punctuated by 4 epidemiologic investigations during outbreak periods. During the study period, 93 neonates were infected and 167 were colonized with MRSA. Surveillance cultures were performed for 1,336 neonates during outbreak investigations, and 115 (8.6%) neonates had MRSA-positive culture results. During 2001-2004, healthcare-associated MRSA clones, carrying SCC mec type II, predominated. From 2005 on, most MRSA clones were community-associated MRSA with SCC mec type IV, and in 2007, USA300 emerged as the principal clone.

Conclusions.

Molecular analysis demonstrated a shift from healthcare-associated MRSA (2001-2004) to community-associated MRSA (2005-2008).

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 31 , Issue 6 , June 2010 , pp. 613 - 619
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2010

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