To : Jan Aiken Re : Varicella (Chickenpox) Vaccine (Varivax) Yes this vaccine is in my newest edition, but to be honest we do not have a lot of data on its use in breastfeeding mothers. It is a live attenuated vaccine, and the virus probably would pass into milk. The virus has been reported to pass between individuals. It is not indicated for infants less than 1 year of age and I would think it unwise to use in mothers of weakened, premature, or immunodeficient infants. Regards Tom Hale