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Editor’s note: Mothers are encouraged to breastfeed their infants. This is also the case for mothers who deliver their infants prematurely. However, mothers who are infected with cytomegalovirus (CMV) and are positive for anti-CMV immunoglobulin Gcan reactivate the virus during lactation and excrete it into their breast milk. To totally inactivate CMV, heating procedures are necessary. Freezing the milk and thawing it again can reduce the virus count but does not completely eliminate virulent CMV, and pasteurization may affect the concentration of growth hormones in human breast milk.