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Porcine reproductive and respiratory syndrome virus (PRRSV) is the cause of an economically important swine disease that has been devastating the swine industry since the late 1980s.The swelling of mitochondrion in PRRSV-infected pulmonary alveolar macrophages (PAMs) was observed by electron microscope.To discover mitochondrial protein responses in PRRSVinfected PAMs,mitochondrial fractions were isolated and labeled with isobaric tags for relative and absolute quantification (iTRAQ) and subsequently liquid chromatography-tandem mass spectrometry (LC-MS/MS) was employed to quantitatively identify the differentially expressed proteins between the PRRSV-infected cells and the controls.A total of 176 cellular proteins isolated from mitochondrion that were significantly altered post-intection were identitied.