Hi Joy,
There was a study earlier this year that looked at the opposite of your question - whether breastfeeding made the rotavirus vaccine less effective (the study concludes yes): http://www.greenmedinfo.com/article/vaccination-proponents-have-suggested-breastfeeding-should-be-delayed-order-prevent-immune-f
Hope that's interesting - there was lots of discussion on this around the interwebs at the time it was released too.
Michelle Branco
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