CROSS-GENUS. “The most surprising results, however, were reported for auxotrophic E. coli cells, to which amino acid prototrophy could be transferred by marine phages at the extremely high rates of up to 2.6 × 10(-3) per virus. Although it is often assumed that phages do not trespass the genus barrier, this concept has been questioned.”
http://onlinelibrary.wiley.com/doi/10.1046/j.1462-2920.2003.00539.x/full