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Fourth day of Rickettsia helvetica infected Vero cells. a Vero cell with Gimenez stained rickettsiae in the cytoplasm. Single bacteria can be seen in the nucleus (arrow) ×400. b Fluorescent photomicrograph of infected Vero cell where a sparse number of bacteria are seen in the nucleus ×1000. c Fluorescent photomicrograph of a filopodia filled with fluorescent coccobacillary rickettsiae stained with specific rabbit anti-rickettsia antibodies ×200
