Fig. 4

Demonstration of infectivity of secreted T. parva sporozoites collected from the in vitro tick feeding system. a Flow cytometric detection of cultured T. parva-infected lymphocytes. b Immunocytochemistry demonstrating T. parva schizont formation in bovine lymphocytes. Lymphocytes were probed with monoclonal antibodies: left panel, isotype control; right panel, anti-PIM. Red indicates antibody-specific reactivity to T. parva within bovine lymphocytes. Scale bar: 20 µm