https://link.springer.com/article/10.1007/BF00343220 er det mest nærliggande eg kan finne:
In contrast, puppies from vaccinated bitches responded well to rabies vaccination only at 10 weeks of age, although detectable maternal rabies VNA and rabies anti-ribonucleoprotein (RNP) antibodies had decreased by 6 weeks post partum.
Kort sagt arver ein litt immunitet, og det kan motvirke vaksinerespons ser det ut til.