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Infectious abortions of goats in Argentina are mainly associated with brucellosis and toxoplasmosis. In this paper, we describe an abortion outbreak in goats caused by  Chlamydia abortus . Seventy out of 400 goats aborted. Placental smears stained with modified Ziehl‐Neelsen stain showed many chlamydia‐like bodies within trophoblasts. One stillborn fetus was necropsied and the placenta was examined. No gross lesions were seen in the fetus, but the inter‐cotyledonary areas of the placenta were thickened and covered by fibrino‐suppurative exudate. The most consistent microscopic finding was found in the placenta and consisted of fibrinoid necrotic vasculitis, with mixed inflammatory infiltration in the tunica media. Immunohistochemistry of the placenta was positive for  Chlamydia  spp. The results of polymerase chain reaction targeting  23S   rRNA  gene performed on placenta were positive for  Chlamydia  spp. An analysis of 417 amplified nucleotide sequences revealed 99% identity to those of  C. abortus  pm225 (GenBank  AJ 005617) and pm112 (GenBank  AJ 005613) isolates. To the best of our knowledge, this is the first report of abortion associated with  C. abortus  in Argentina.

First report of caprine abortions due to Chlamydia abortus in Argentina