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Active uptake of ESC vaccine strains in catfish peritoneal macrophages shown by light microscopy. The column on the left shows phagocytosis of E. ictaluri strains at 32°C, and the right column shows phagocytosis E. ictaluri strains at 4°C. Arrows indicate intracellular, engulfed bacterial cells in the cytoplasm and phagosomes of peritoneal macrophages.
