I can't find much definite data on either part of this. There are anecdotal reports of breastfed babies having milder cases of chicken pox, but no hard figures or comparisons, so take those with caution. If there is any benefit, then it's thought to be largely due to protection from factors other than antibodies. I can't find anything on possible protection from breastfeeding by an immunised mother.

One important thing to remember is that any protection that breastfeeding does give will be temporary only - once the breastfeeding stops, so will the protection. (Unlike protection from immunisation, which stimulates the body to provide active immunity which is long-lasting.)

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