What type of changes are seen in bursa of birds if they are infected with IBDV during the first week.

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Kuldip Gupta

If birds are infected with virulent strain of IBDV during the first week of life, severe depletion of bursal stem cells is observed which is grossly evident as atrophy of bursa of Fabricius.

Paul Wigley

Depletion of follicles leading to atrophy/shrinkage of the bursa and as a consequence suppression of antibody responses