Figure 1From: Sulphonamide resistant commensal Neisseria with alterations in the dihydropteroate synthase can be isolated from carriers not exposed to sulphonamidesAP-PCR patterns of Neisseria isolates The isolates were obtained from samples collected from the same patients at three separate occasions: sample A at time zero, sample B two weeks later and sample C one year later. Sulphonamide sensitive isolates are marked with S. Resistant isolates are marked with R and the clone to which they belong. m=molecular size markersBack to article page