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ABSTRACT. Balthazar L.M. de C., Lopes B. do B., Berto B.P., dos Santos C.S., Teixeira Filho W.L. Neves D.M. & Lopes C.W.G. Coccidiosis in a Blue-fronted Amazon parrot (Amazona aestiva) under quarantine - Case report. [Coccidiose em um papagaio verdadeiro (Amazona aestiva) mantido em confinamento - Relato de caso]. Revista Brasileira de Medicina Veterinária, 35(4):392-396, 2013. Programa de Pós-Graduação em Ciências Veterinárias, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Campus Seropédica, BR 465 Km7, Seropédica, RJ 23897- 970, Brasil. E-mail: firstname.lastname@example.org An adult male blue-fronted Amazon parrot (Amazona aestiva), was kept under quarantine in CETAS/IBAMA Seropédica, RJ, Brazil. Clinical signs consisted of apathy, anorexia, weight loss, ruffled and dull feathers and greenish mucoid diarrhea. Feces were observed stuck to the feathers around the cloacae. Oocysts of the both sample were placed in a 2.5% solution of K2 Cr2 O7 to allow them to sporulate. Upon microscopic examination, unsporulated oocysts were observed in the feces of the first sample. However, oocysts of the second sample, collected three days after the first sample, sporulated and they were recovered for determining the species. The oocysts varied from ovoidal to ellipsoidal with 27.9 x 26.9µm in diameters, with a smooth wall consisting of two layers of 1.4µm thickness. Micropyle and oocyst residuum were absent, but polar granules were present. Sporocysts were elongated and ellipsoidal measuring 19.6 x 11.1µm. The Stieda body presented a knob-like appearance and was slightly pointed in the external surface. The substieda body was undefined. The sporocyst residuum was composed of scattered granules and the sporozoites were vermiform with a refractile body and a nucleus. The characteristics of the oocysts were similar to those described previously as Eimeria amazonae. In addition to the case report of a clinical coccidiosis, comments on geographic distribution and interspecific infections are presented herein.