Described in this study are the immunohistochemical and ultrastructural findings in a case of caprine abortion due to the experimental infection of the dam with strain GM13 of Mycoplasma capricolum subsp. capricolum. Mycoplasma antigens were seen mainly in choriallantoic trophoblasts and in the lumen of blood vessels in the allantoic membrane. Examination with an electron microscope showed that the chorioallantoic trophoblasts were filled with typical mycoplasma organisms. No other bacteria were observed in any of the samples. Our results confirm by immunohistochemical and electron microscopic techniques that Mycoplasma capricolum subsp. capricolum can cause caprine abortion and that the process can occur without premonitory signs.
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