CD79A and vitamin A deficiency: The Vac+VitA VAS group had the highest mean serum and intestinal HRV IgA antibody titers and lowest mean serum HRV IgG antibody titers of all vaccinated groups post-challenge and vice-versa for the Vac VAD group suggesting that vitamin A deficiency may have affected the balance of HRV IgA/IgG isotypes.