Swine influenza virus was found to be regularly present in the turbinates, tracheal exudate and lungs of infected swine but not in the spleens, livers, kidneys, mesenteric lymph nodes, colon mucosae, brains or blood. It was present in low concentration in the bronchial lymph nodes of 2 out of 8 animals. This localization of the virus in swine accords with its classification as a pneumotropic virus.

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