Anderson (Clinical Pharmacy, Vol 10, Aug 1991, p.612) states: Breast-feeding is not a contraindication to the use of any vaccine in the mother. He references: Immunization Practice Advisory Committee. General recommendations on immunization. MMWR. 1989; 38:205-27. I know that the reference is a little old, but the recommendation includes Smallpox Vaccine, and I don't see why the recommendation wouldn't hold for Varicella Vaccine also. This is the best I can do in answering the question about whether Varicella Vaccine is safe for a breastfeeding mother. Frank J. Nice