Eimeria acervulina and E. mivati: oocysts, life-cycle and ability to develop in the chicken embryo

Abstract

SUMMARYThree strains of Eimeria acervulina and 3 strains of E. mivati were compared. E. acervulina was characterized by the ovoidal shape of its oocysts and their rapid sporulation, small first-generation schizonts containing few merozoites, and its inability to complete development in the chorio-allantois of chicken embryos. E. mivati had more rounded oocysts with a Longer sporulation time, larger first-generation schizonts containing twice as many merozoites and it developed readily in the chorio-allantois. Pre-patent periods were variable but generally shorter with E. acervulina. A strain of E. mivati attenuated by repeated embryo passage showed a reduced pre-patent period.

Contribution on the study of Isospora hemidactyli Carini, 1936 and a report of an adeleid pseudoparasite of the house gecko Hemidactylus mabouia, from the Rio de Janeiro Metropolitan Region, Brazil

“…Besides it, the linear regression also confirmed the homogeneity of this species, as observed by Norton and Joyner (1981) and Pereira et al (2001) for other coccidia.…”

“…Histograms were based on Sampaio (2002) and they represent the width, length and shape-index values of the oocysts and sporocysts and their respective frequencies. Linear regressions for width on length were done according Norton and Joyner (1981) and Pereira et al (2001).…”

Isosporoid Coccidia (Apicomplexa: Eimeriidae) parasites of tanagers (Passeriformes: Thraupidae) from the Marambaia Island, Brazil

“…oocysts, regressions were performed for each host individually, but the graphics were superimposed for better visualization. The method is in agreement with Norton & Joyner (1981), Sampaio (2002) and Berto et al (2008c,d,e). Graphics with the waste and coefficients of regression lines were obtained through the software Microsoft Excel 2007®.…”

New approaches for morphological diagnosis of bovine Eimeria species: a study on a subtropical organic dairy farm in Brazil

“…sporulated oocysts using methods proposed by Norton and Joyner (1981) and subsequently modified by Berto et al (2014). The graphs and coefficient of regression line were obtained using the software Microsoft Excel 2007 ® .…”