4 Pathological evaluation

Gross lesions of interstitial pneumonia and enlarged lymph nodes due to PRRS infection may be observed. However, these lesions can be also observed during other infections.

As previously mentioned, there are no pathognomonic gross lesions in lungs from pigs suffering PRRS respiratory outbreaks, neither in sows or aborted fetuses from PRRS reproductive failures.

Microscopically, interstitial pneumonia is the primary lesion, but it is nonspecific for PRRS virus.

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