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Identification of vaccine emulsion forms. NDV vaccines were emulsified in E515-D, Marcol 52 and #10 white oil (A). The vaccine emulsion was dispersed in vegetable oil or stained with liposoluble dye Sudan III (B) but not dispersed in water or stained with water-soluble dye eosin Y (C), indicating all the vaccine emulsions were water in oil (W/O). Abbreviation: NDV, Newcastle disease virus.
