The percent of larvae expressing lacz gradually increased for various time points after inoculation , but the percent of larvae expressing lacz reduced after 20 hours post inoculation , we thought the infection spots transformed 、從卜又’蕎!鄉(xiāng);三、卜率卻有所降低,對此,我們分析其原因可能是由于病毒的感染部位發(fā)生了轉(zhuǎn)移。
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 結(jié)果表明,病毒感染后12 48小時,雛雞法氏囊粘膜上皮細胞腫脹、壞死脫落,淋巴濾泡髓質(zhì)部及皮質(zhì)部淋巴細胞不同程度變性、壞死、排空,形成腺管樣結(jié)構(gòu)或囊狀空泡,接毒后72 144小時,法氏囊淋巴濾泡淋巴細胞壞死排空,淋巴濾泡萎縮,網(wǎng)狀結(jié)締組織大量增生,而胚胎發(fā)育時期,法氏囊粘膜上皮腫脹變性,法氏囊淋巴濾泡形成延遲或不完整,淋巴濾泡內(nèi)淋巴細胞缺乏或空虛。