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Aurélie Mathieu (Université Paris-Saclay) and colleagues have published an exciting new paper in Nature Communications: they isolated 150 E. coli phages from fecal samples from 1-year-old infants. Then they analyzed the host range of the phages on 75 E. coli strains. They saw that temperate phages outnumbered virulent ones, and that most E. coli strains were resistant to temperate phages but sensitive to virulent phages.