Hemorrhagic tracheitis syndrome is an emerging condition of nursery pigs and less commonly in growing pigs characterized by tracheal hemorrhage and edema (Figure A) accompanied by variable degrees of necrohemorrhagic, fibrinonecrotizing or suppurative inflammation. Although the syndrome is increasingly recognized during diagnostic investigations, its etiology remains poorly understood, and no definitive causative agent has been established. Recent observations suggest that respiratory pathogens capable of damaging the tracheal epithelium may contribute to lesion development, particularly swine influenza virus and Mycoplasma hyopneumoniae. A recent publication has identified SIV within affected tracheas by PCR and IHC.
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