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Inhibition of V. cholerae motility requires intact IgG antibody binding. Wild-type V. cholerae was incubated with commercial IgG that is specific against O-antigen at subagglutinating concentrations. Percentages of motile bacteria after antibody addition were recorded (A), and the relative amounts of IgG or Fab bound to bacteria were calculated using fluorescently labeled antibody (B). Each symbol represents samples from one experiment. Bars are means with standard deviations.
