Figure 5From: 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 hind-gut of trout. Detection of F. psychrophilum antigen in hind-gut: A unvaccinated B day 2 pv and C day 7 pv. Brown staining indicates positive staining for antigen. Bar: 50 µm.Back to article page