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Ouchterlony agar-gel immunodiffusion. Carbohydrate antigen extracts of KFP 173, KFP 186, and KFP 196 recent isolates (wells 5, 4, and 3, respectively); Dan 1 early isolate (well 1); and the fish pathogen Lactococcus garvieae ATCC 43921T (well 2, negative control) were reacted against anti-KFP 173 serum (central well).
