Eimeria spp is a protozoan parasite with a complex life cycle and so is the host immune response to Eimeria infection. In the last decade, huge progress has been made in the identification of host and parasite genes involved in immunogenicity but there are still some immunity mechanisms to be discovered.
As a general rule, we say that Eimeria immunity is species-specific, meaning that each species of Eimeria is able to stimulate protective immunity against itself. Although some studies suggest that partial cross-protection can be achieved (Augustine et al. 1991), from a practical perspective we have to assume the widely accepted belief that there is no cross-protection between species.
Continue reading Eimeria immunogenicity, basic information and protection conferred by a precocious line of Eimeria necatrix.
The Eimeria biological cycle is a very complex one and is comprised of intracellular, extracellular, asexual and sexual stages. It is of paramount importance its understanding as its comprehension helps to understand the parasite epidemiology in the field, its pathogenicity and immunobiology.
Seven species of Eimeria (E. acervulina, E. brunetti, E. maxima, E. mitis, E. necatrix, E. praecox and E. tenella) are recognized to be causative agents of coccidiosis in chickens of the genus Gallus gallus.
Continue reading Eimeria biological cycle: an example of perfect complexity in biology