ATROPHY OF THE BURSA FABRICIUS IN THE INCIDENCE OF MULTIPLE INFECTIONS BY AVIAN INFLUENZA AND NEWCASTLE DISEASE VIRUS IN FREE-RANGE CHICKEN. bulvet [Internet]. 2024 Jul. 31 [cited 2026 Sep. 20];16(4):1316-29. Available from: https://ejournal3.unud.ac.id/index.php/buletinvet/article/view/365