Figure 2
SEM micrographs showing (A) uninfected AOC-45 cells, (B) H. parasuis serovar 4 strain adhered to AOC-45 cells, (C) H. parasuis serovar 5 strain adhered to AOC-45 cells, (D) a small number of serovar 9 strain H. parasuis cells adhered to AOC-45 cells, (E) a high number of serovar 5 strain H. parasuis cells adhered to AOC-45 cells, (F) a moderate number of serovar 4 strain H. parasuis cells adhered to AOC-45 cells, (G) a bacterium belonging to the H. parasuis serovar 5 strain projected into AOC-45 cells, as indicated by the asterisk (*) and (H) a bacterium belonging to the H. parasuis serovar 4 strain invading AOC-45 cells, as it is indicated by the asterisk (*). Concentration of the bacterial inoculum: approximately 108 CFU. Incubation time: 240 min. Morphological differences between the strains of serovars 4 and 5 are indicated by (>).