A CDC study found that the rate of "invasive" hospital-acquired infections with the methicillin-resistant Staphylococcus aureus bacteria dropped by an average of 9% each year from 2005 to 2008. "While we don't know for sure what caused these rates to go down, we're hopeful and encouraged that the aggressive infection-control programs that many hospitals have instituted are having an impact," the lead researcher said.

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