Err... what am I missing here? These graphs simply show that vaccinating the parents, especially the mother, protected the offspring from exhibiting a clinical sign of infection (weight loss) following viral challenge.

Is this protection from alteration of the pups' DNA, or is it from colostral immunity? The fact that vaccination of the mother was far more influential than vaccination of the father suggests that passive transfer of maternal antibodies (i.e., immunoglobulins in colostrum) could explain these results. When the mum wasn't vaccinated, her babies lost weight when challenged with the flu virus. Looks like plain ol' colostral protection to me. What am I missing?

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