What they are concerned about is CMV.  There was a atudy by Vochem a few
years ago that demonstrated that even when Moms have antibodies to CMV in
their milk, the VERY tiny ones 24-28 weeks, can get symptomatically ill from
CMV in Mom's milk.  The simplistic approach is to freeze all milk (kills 99%
CMV).  The better, but more expensive way to do it is to test all Moms who
deliver < 30 weeks for CMV, and only freeze the ones who are positive until
the infant's immune system is good enough to become infected without becoming
symptomatic/ill.

Nancy E. Wight MD, FAAP, IBCLC
Neonatologist
Medical Director, Lactation Services
San Diego, CA, USA

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