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Passaging of rH1N1 virus in pigs caused progressive body temperature rise. Rectal temperature was taken at two fixed time points daily from 0 to 4 dpi for P1 and P2 (blue), P3 to P6 (orange), P7 to P9, positive-control SD731 virus-inoculated (red), and mock-infected (cyan) pigs. All values shown represent the mean rectal temperature per day for each animal. A temperature higher than 39.5°C is considered pyrexic in pigs.
