Since the host range spots tests tended to overestimate the virulence of the phages tested, EoP was performed for the four phages (vB_EcoS_K1-ULINTec2, vB_EcoP_K1-ULINTec4, vB_EcoP_K1-ULINTec6, and vB_EcoP_K1-ULINTec7) and suggested abortive infection (non-productive phage infection that kill bacteria) in some cases. The gene discussed is KRT1; the disease is infection.