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A Distribution of NEC scores in Charles River (solid bars) and Harlan Labs (open bars) rats. B, Numbers of different bacterial strains found in litters. C, Numbers of bacterial strains found in individual animals. B and C show data for combined breast fed and formula fed population. D, average logarithms of total bacterial loads in animals with NEC (scores 2–4, n = 60) and without NEC (scores 0–1, n = 72).
