Transmission of methicillin-resistant Staphylococcus aureus to preterm infants through breast milk.

Objective: To determine a potential source of MRSA colonization and infection among preterm infants in a neonatal intensive care unit (NICU) using molecular analysis of breast milk samples.

Design: Case report, outbreak investigation.

Results: Preterm triplets were delivered at 26 weeks' gestation via cesarean section when routine active surveillance for MRSA was performed for all infants in a NICU.