degree of degeneration meaning in English

退化程度
退化度

The results showed that , at 12 48 hrs post infection , the bursal epithelial cells bore swollen and necrotic shape . the lymphoid cells in the medulla and cortex of lymphoid follicles had various degrees of degeneration and necrosis . the lymphoid follicles showed glandular structures or cystic vacuoles owing to the prolifetation of bursal epithelium and lymphocyte depletion . lymphoid follicles from bursa at 72 144 hrs post inoculation became atropy . marked proliferation of interfollicular and interstitial connective tissue was present
结果表明，病毒感染后12 48小时，雏鸡法氏囊粘膜上皮细胞肿胀、坏死脱落，淋巴滤泡髓质部及皮质部淋巴细胞不同程度变性、坏死、排空，形成腺管样结构或囊状空泡，接毒后72 144小时，法氏囊淋巴滤泡淋巴细胞坏死排空，淋巴滤泡萎缩，网状结缔组织大量增生，而胚胎发育时期，法氏囊粘膜上皮肿胀变性，法氏囊淋巴滤泡形成延迟或不完整，淋巴滤泡内淋巴细胞缺乏或空虚。