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. 2020 Jul 20;8(3):399. doi: 10.3390/vaccines8030399

Figure 5.

Figure 5

Figure 5

PCR detection and histopathological analysis in the passage test. (A) DNA was extracted from the blood of the first four generations, and PCR was carried out using primers 1 + 4 to detect rMDV; the target gene was 1730 bp (a: first generation; b: second generation; c: third generation; d: fourth generation; 1, 2, 3, 4, 5, 6: chickens of each generation). (B) DNA was extracted from the feathers of the fifth generation, and PCR was carried out using primers 1 + 2, 1 + 3, 1 + 4 to detect rMDV (a: rMDV detection by primers 1 + 2, and the target gene was 827 bp; b: rMDV detection by primers 1 + 3, and the target gene was 1448 bp; c: rMDV detection by primers 1 + 4, and the target gene was 1730 bp). (C) On the 60th day, visceral tissues of the fifth generation were collected for histological examination (a: heart; b: liver; c: spleen; d: lung; e: kidney; f: bursa).