By 21 days post-challenge, gross and microscopic lesions of lymph nodes and lungs in non-vaccinated but challenged pigs were significantly more severe than those found in vaccinated groups.

在攻毒后21天剖检，攻毒对照猪的淋巴结和肺脏的大体和显微病变都比免疫组猪严重。

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By 21 days post-challenge, gross and microscopic lesions of lymph nodes and lungs in non-vaccinated but challenged pigs were significantly more severe than those found in vaccinated groups.

在攻毒后21天剖检，攻毒对照猪的淋巴结和肺脏的大体和显微病变都比免疫组猪严重。

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