Abstract

Tailed bacteriophages are abundant and extremely diverse. Understanding this diversity is a challenge, and here we examine a small slice of that diversity in some detail. We contrast and compare the small genome, virulent, non-contractile tailed phages that infect the bacterial order Enterobacteriales. These phages, with genomes in the 35–60 kbp range, have very similar virions that are often difficult to distinguish by negative stain electron microscopy. There are currently 651 genome sequences of such phages in the public database. We show that these can be robustly parsed into fifteen well-defined clusters that have very different nucleotide sequences. We examine the similarities and differences among these clusters, as well as genetic exchange among clusters and the relationships between host species and phage clusters.

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