Figure 2From: Interactions of highly and low virulent Flavobacterium columnare isolates with gill tissue in carp and rainbow trout Gill section of a carp challenged with the HV-isolate at SP 2. The bacterial cells are surrounded by a PAS-positive matrix (thin arrows, magenta) enveloped by AB-positive mucins (thick arrow, blue). F = gill filament; L = gill lamella (PAS/AB, bar = 75 μm).Back to article page