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SUMMARY: The placenta is the primary site of infection of Chlamydia psittaci and is also intimately involved in the control of parturition. Changes in the pattern of placental hormone secretion were investigated in ewes infected with C. psittaci and in saline-injected controls. The concentration of progesterone in peripheral plasma of infected sheep was significantly lower than in control sheep (P P<0.05) in four out of 12 samples obtained from Chlamydia-infected sheep over the same period. The changes in progesterone and prostaglandin E2 were temporally related to the morphological and histochemical changes characteristic of trophoblast infection. These findings suggest that C. psittaci infection may precipitate premature labour by altering placental steroid and prostaglandin release.

microbiology

Changes in Progesterone, Oestradiol 17 , and Intrauterine Prostaglandin E2 during Late Gestation in Sheep Experimentally Infected with an Ovine Abortion Strain of Chlamydia psittaci