TABLE 2

Susceptibility of Escherichia coli O157:H7 phage types to phages ALC35, ALS20 and ALC54a

PhagePhage groupbExtremely sensitiveHighly sensitiveModerately sensitive PTsResistant LPTe
PTscLPTsdPTsLPT
ALC35α1, 10, 14, 14a, 21, 23, 28, 32, 34, 46, 47, 48, 68, 80, 884, 14a4, 24, 49, 67, 74432, 8, 31, 33, 38, 45, 50, 51, 54, 6391
ALS20β1, 4, 24, 28, 45, 46, 47, 49, 50, 67, 68, 74, 8814a, 432, 8, 10, 14, 14a, 21, 23, 31, 32, 33, 34, 38, 48, 54, 63, 80491
ALC54γ1, 2, 4, 8, 10, 14, 14a, 21, 23, 24, 28, 31, 32, 33, 34, 38, 45, 46, 47, 48, 49, 50, 51, 54, 63, 67, 68, 74, 80, 884, 14a, 43, 91
  • a Susceptibility was defined as follows: extremely sensitive, MOI of <0.01; highly sensitive, MOI ≥0.01 and <1; moderately sensitive, MOI of ≥1 and <10; resistant, no lysis observed.

  • b Phage groups are based on genome sizes: 42.4 kb for group α, 91.6kb for group β, and 182.7 kb for group γ.

  • c PTs are phage types from E. coli O157:H7 collection of the Laboratory for Food-borne Zoonoses, Public Health Agency of Canada (PHAC), Guelph, ON, Canada.

  • d LPTs are phage types of E. coli O157:H7 isolated during the present study.

  • e There were no resistant PTs or LPTs for ALC54.