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Gastrointestinal passage of the orally added phages in conventional mice. Fecal phage titer after oral addition of the specified phage strain at 106 (circles), 105 (diamonds), 104 (squares), and 103 (bars) PFU/ml, fed to four mice at the times indicated by the shaded bars at the bottom of the figure. The triangles give the phage titers for the control mice. The periods of phage-free drinking water are indicated by white boxes.
