Figure 3From: Efficacy of a polyvalent immersion vaccine against Flavobacterium psychrophilum and evaluation of immune response to vaccination in rainbow trout fry (Onchorynchus mykiss L.) Immunohistochemical detection of antigen uptake following immersion vaccination in skin of trout. Detection of F. psychrophilum antigen in skin of trout at A unvaccinated B 4 h pv and C day 2 pv. Brown staining indicates positive staining for antigen. Bar: 20 µm.Back to article page