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Identification of Mycoplasma hyopneumoniae in formalin-fixed porcine lung, using an indirect immunoperoxidase method.

An indirect immunoperoxidase staining technique was evaluated for detection of Mycoplasma hyopneumoniae in formalin-fixed, paraffin-embedded porcine lung. Lungs from swine with induced (n = 4) or naturally occurring M hyopneumoniae infection (n = 31) were examined grossly, by light and immunofluorescent microscopy, and by an indirect immunoperoxidase test, using antibody raised in swine against M hyopneumoniae as the primary antibody. Organisms stained by the indirect immunoperoxidase method were identified in tissue sections as pleomorphic brown-staining structures corresponding to those observed with immunofluorescence. Mycoplasma hyosynoviae, M hyorhinis, and Acholeplasma laidlawii did not stain with the indirect immunoperoxidase method, using antibody raised against M hyopneumoniae.