Figure 9.

Effect of virulence on association of B. burgdorferi with human neutrophils. The non-virulent Bb-HP strain was compared to the virulent Bb-LP strain with respect to kinetics of association with human neutrophils. Values are expressed as mean ± standard deviation and obtained from four different experiments carried out in duplicates with neutrophils isolated from four different donors. Asterisks express statistical significance between the two strains: * p ≤ 0.05, ** p ≤ 0.01, *** min p ≤ 0.001.