Histological analysis of positive bursa of Fabricius ( BF ) revealed atrophied follicles and lymphocyte depletion .
The number of CD8 ? , CD4 ? and IgM ? cells was lower in infected BF .
Histological analysis of positive bursa of Fabricius ( BF ) revealed atrophied follicles and lymphocyte depletion .
The number of CD8 ? , CD4 ? and IgM ? cells was lower in infected BF .