Abstract
Toxoplasma gondii is an important food-borne parasite transmitted primarily from animals to humans through meat consumption, mainly pork and lamb, as well as through oocysts shed by cats. Infection in humans can cause severe neonatal malformations, ocular complications or encephalitis. Toxoplasmosis infection during pregnancy, especially in sheep, often results in abortion, representing considerable economic loss. The aim of this study was to investigate whether Toxoplasma gondii pooled excreted-secreted antigens (ESA), recovered from infected culture supernatants with tachyzoites used as immunogen, can protect experimental mice against T. gondii infection. For immunization experiments, we evaluated A/Sn inbred mice, a novel susceptible mouse model for T. gondii and a virulent strain (RH) for challenge experiments. The antigen selection was based on those produced by tachyzoites since they are responsible for disseminating the infection as well as stimulating the humoral and cellular immune responses. ESA were recovered from VERO cell-culture supernatants infected with virulent RH strain tachyzoites harvested after 48 h. Groups of 5 female mice were intraperitoneally (i.p.) immunized with 4 doses at 2 week intervals with 20 mic...Continue Reading
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