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Denish Piya (UC Berkeley) and colleagues at the Center for Phage Technology in Texas published a new paper in Scientific Reports on using genome-wide screens to identify Escherichia coli host factors required for propagation of two novel phages (T1- and V5-like). This is the first time genome wide screens have been done for these classes of phages. And what's more, these phages are available as components of a prebiotic, PreforPro.