STUDIES ON THE SCANNING ELECTRON MICROSCOPY (SEM)
OF THE OOCYSTS OF V ARIOUS EIMERIA
SPECIES
Rahmatullah Rind, A. J. Probert1 and
A. J. Rind2
Department of Microbiology, Faculty of Animal Husbandry
and Veterinary Sciences, Sindh Agricultural University, Tandojam; 1University
of Wales, Bangor, United Kingdom, 2People's Medical College,
Nawab Shah, Sindh, Pakistan
Abstract
Preliminary studies on the morphology of the
oocysts of several species of Eimeria of cattle, using electron microscopy have
shown the surface structure of the oocysts of several species. The entire
surface of E. bovis was covered with ridges and giving an overall rough
appearance to the oocyst. The surface of E. canadensis appeared cloudy
relatively smooth with small scattering papillae and the border of the wall
appeared smooth. The oocyst of E. alabamensis contained large micropores of
different sizes in its wall~ At least 9 clear pores were found on the surface of
oocyst. The surface of E. ellipsoidalis appeared"smooth with no distinguishing
features. While E. brasiliensis entire surface was covered with small, very fine
papillae. The polar cap appears to be thicker at the top and thinner at its
point of attachment to the wall. The oocyst of species of E. auburnensis
appeared cloudy and the wall is covered with very tiny papillae. The papillae
look to be embedded in the matrix of the wall. However, scattered papillae were
also seen on the oocyst wall of E. cylindrica.
Key words: Eimeria spp., oocysts, scanning electron
microscopy.