CD79A and infection: The results demonstrate that infection with C. perfringens led to a significant increase in the frequency of both IgA+ (p ≤ 0.0001) (Figure 9B) and IgY+ (p ≤ 0.0001) (Figure 9C) Bu1+ B cell within the duodenum, jejunum and cecal tonsils when compared to the control chickens.