He said that boosting a mother's vaccine prior to pregnancy will not increase the level of maternal immunity in the puppies. (caberfeidh.com)
Maternal - derived immune factors can provide protection during the vulnerable neonatal period, and various methods are being utilized to exploit maternal immunity or enhance neonatal acquired immunity. (immunology2018.org)
Puppies that have not gotten enough maternal immunity are at more risk of getting a disease. (k9puppydogs.com)