Abstract
The helminth parasite Fasciola hepatica modulates the host immune response at early stages of infection (Rodríguez et al., PLoS Negl Trop Dis 9:e0004234, 2015; Vukman et al., J Immunol 190:2873-2879, 2013). Nevertheless, little is known about the cell composition of the peritoneal fluid at these early stages of infection.In this chapter, we describe a method to perform peritoneal lavages and to recover peritoneal fluid from sheep experimentally infected and noninfected with F. hepatica at early stages of infection. In addition, with the aim to characterize the peritoneal fluid immune cell phenotype, we describe a procedure to obtain the total leukocyte count, the differential leukocyte count and the preparation and storage of peritoneal fluid smears, together with the application of an immunocytochemical technique and an automatic method to count the immunoreactive cells. Finally, the present protocol describes the evaluation of the gross and the histopathological lesions together with the immunohistochemical analysis of the hepatic tissue.
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