An interesting free full text article on this topic:

http://www.pubmedcentral.gov/pagerender.fcgi?artid=295980&pageindex=6#page

The "take home" message is that babies are protected from HTLV-1 
transmission through antibodies transferred through the placenta, which 
last about 3-6 months.  If mom continues to bf for 6 months or more, the 
baby's risk of becoming infected with HTLV-1 rises.
Catherine Watson Genna, IBCLC  NYC

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