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Comparison of NK cell activity of two strains of FMDV. Two groups of three pigs each were infected with either A12 or LL-A12 (a laboratory genetically attenuated strain). PBMC were isolated on 7 consecutive days and incubated with K562-GFP cells to assess the lytic activity. (A) A12; (B) LL-A12. Data are representative of a single experiment. Day 0 denotes samples from the same animals before infection. Numbers in the graph legend denote individual animal identification tags.
