Study Demonstrates Seasonality of MRSA Infections

May 31, 2011

MRSA Bacteria. Photo Credit: CDC

In a recent study published in PLoS One, search researchers from Rhode Island Hospital in Providence demonstrated seasonality for both community-associated (CA-) and hospital-associated (HA-) methicillin-resistant Staphylococcus aureus (MRSA) infections in children. MRSA infections were shown to be more frequent in summer and fall.  The team, decease led by Dr. Leonard Mermel, drugs  Medical Director of the Department of Epidemiology and Infection Control at the Rhode Island Hospital in Providence, analyzed MRSA samples from the microbiology department of the hospital that had been taken over a 10-year period.  MRSA isolates were analyzed for the number of emergency department visits, quarterly CA-MRSA infections, and quarterly HA-MRSA infections.

Results:

Pediatric patients experienced 1.8 times as many CA-MRSA infections per emergency department visits occurring in the second two quarters as compared to the first two quarters.

Pediatric patients also experienced 2.94 times as many HA-MRSA infections per emergency department visits in the second two quarters as compared to the first two quarters.

MRSA infections in adults showed less seasonal influence. For adult patients, there were 1.14 times as many CA-MRSA infections in the second two quarters as compared to the first two quarters. No seasonal variation was observed for HA-MRSA infections in adults regardless of quarter.

Reference: Mermel, L.A., Machan, J.T., and S. Parenteau. Seasonality of MRSA. PLoS ONE, 6(3): e17925. doi:10.1371/journal.pone.0017925.

 

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