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Tilapia spleen tissue section with H&E stain at 5 h after S. agalactiae infection. Red arrow shows multifocal hemosiderin deposition; green arrow shows the congestion of blood vessels; blue arrow shows large thrombus; pink arrow shows macrophages. (A) Control group without S. agalactiae infection; (B) susceptible group 5 h postinfection with S. agalactiae; (C) resistant group 5 h postinfection with S. agalactiae. Scale bars, 500 μm.
