PRRS弱毒株
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The results showed that the numbers of IEL in tracheas was increased significantly (P<0.01) with PRRS attenuated strain immunization by nasal route contrast to muscle injection and control group;
气管IEL数目的变化：PRRS弱毒株鼻腔免疫组IEL数量比对照组和肌肉免疫组呈极显著增加（P<0.01），PRRS弱毒株肌肉注射免疫组IEL数量与对照组无显著变化。
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