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Questions about the CDC's preference for CHG

1. What did Dr. Maki’s study, cited by the CDC in classifying 2% CHG formulations as “preferred”, actually test?
2. Doesn’t the CDC recommend ChloraPrep^® and not Betadine^® (Povidone-Iodine) for catheter site maintenance?
3. Based on what is known today, is the basis for CDC’s “preference” toward 2% CHG-based antiseptics appropriate for catheter site care?