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Basically, I have read about RH disease, Its rare but it can happen when an RH + baby is conceived by an RH - mother. This raises many questions. I have heard this problem only happens with humans, if so, why doesn't it affect other mammals like Rhesus monkeys? Where along the evolutionary time-line did RH disease come about in the first place?

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Have you read this ? –  biogirl Dec 6 '13 at 9:32
I have read it now. It is a similar issue. A newborn has issues with a mother's antibodies that are in the mother's milk that they were not immunized to during pregnancy. These antibodies were brought about by sensitization (the same process that triggers RH disease). The difference being the antibodies do not crossover the placenta barrier during pregnancy. Although similar, it is not RH disease in mammals other than humans. –  Alexander Ryan Baggett Dec 6 '13 at 14:22
@biogirl essentially the difference is that one occurs during pregnancy the other during nursing. –  Alexander Ryan Baggett Dec 23 '13 at 19:15
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