I only know what I learned in Uganda this fall.  Moms given antivirals 
during pg, babies are breastfed and baby begins antivirals at  1 week. 
Their seroconversion rate has dropped from 16% tp 6%.  Their mortality rates 
when they were using formula instead of BF were extremely high - I heard 50% 
in the rural areas, because the water supply etc is poor.
 Some of our members in S. Africa can probably give us real research  That's 
where a lot of the early research on BF & HIV seroconversion was done.  :-)
Pat in SNJ 

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