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Histopathological analyses of tissue samples from commercial chickens in-ovo vaccinated with different NDV strains. The lung and trachea samples were collected from in-ovo vaccinated chickens (PBS, TS09-C and V4 group) at 7 dph, fixed in 4% paraformaldehyde, paraffin embedded, sectioned and stained with hematoxylin-eosin, and analyzed under a microscope. Scale bar = 200 μm.
