Figure 2. Expression of fHbp in meningococcal serogroup W isolates from Ghana and Burkina Faso, assessed by Western blotting.

Bars represent the mean percentage from three biological replicates compared with the expression of fHbp of the reference group B strain 8047, a high expresser of fHbp variant 2 ID 77, which was set at 100%. Isolates with means below 33% were classified as low expressers while isolates with expression above 100% were categorized as high expressers. Values between 33–100% were considered as intermediate expression. Bars represent standard errors.