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Transmission electron microscopy analysis of B. anthracis-A. castellanii interactions. (A and B) Micrographs show spores of strain 9131 contained in A. castellanii phagosomes (open arrowheads) after 6 and 12 h of coculture at 37°C, respectively. (C) A vegetative Sterne spore within an A. castellanii trophozoite in a phagosome after 6 h of coculture. (D) Vegetative forms of Sterne inside and outside amoebas after 12 h of infection (black arrows). N, nucleus; vf, vegetative form.
