Table 1.

Characteristics of human STEC isolates in Finland, 1990 to 1997

Yr, type of surveillance (date [day mo] of sample retrieval)OriginSerotypestxgeneaeaeAb Stx1 titercStx2 titercSordPFGEeAntimicrobial resistancefPGUA productionbEhlyf
1990, normal surveillance
 21 MayTurkeyO157:H72+1:81as+
 13 JulDomesticO157:H71, 2+1:1281:1281fs+
 1 OctSpainO157:H71, 2+1:161:1281cs+
1992, normal surveillance
 22 OctDomesticO157:H72+1:1281ds+
1996, enhanced surveillance
 17 MarDomesticOX3:H2121:128+s+Non
 31 JulSpainO157:H72+1:1281gs+
 10 SeptSingaporeO26:H111+1:16+2cStr++
 5 OctDomesticRough:H4921:16+Str+Non
 10 OctTurkeyO91:H402+1:4+Tet+Non
 4 DecDomesticO157:H72+1:1281dAmp+
1997, enhanced surveillance
 19 JanDomesticO165:H252+1:128+s++
 25 JanDomesticO157:H72+1:1281bs+
1997, normal surveillance
 24 MarDomesticO157:H72+1:1281bs+
 22 MayDomesticO157:H72+1:1281as+
 25 MayDomesticO157:H72+1:1281as+
 2 JulDomesticO157:H72+1:1281as+
 3 JulDomesticO157:H72+1:1281as+
 7 JulDomesticO157:H72+1:1281as+
 5 JulDomesticO157:H72+1:1281as+
 5 JulDomesticO157:H72+1:1281as+
 6 JulDomesticO157:H72+1:1281as+
 8 JulDomesticO157:HNM2+1:128+s+Non
 11 JulDomesticO157:H72+1:1281as+
 11 JulDomesticO157:H72+1:1281as+
 12 JulDomesticO157:H72+1:1281as+
 11 JulDomesticO157:H72+1:1281as+
 11 JulDomesticO157:H72+1:1281as+
 11 JulDomesticO157:H72+1:1281as+
 14 JulDomesticO157:H72+1:1281as+
 14 JulDomesticO157:H72+1:1281as+
 14 JulDomesticO157:H72+1:1281as+
 16 JulDomesticO157:H72+1:1281as+
 17 JulDomesticO157:H72+1:1281cs+
 18 JulRussiaO157:H72+1:1281cs+
 21 JulDomesticO157:H72+1:1281ds+
 23 JulDomesticO157:H72+1:1281ds+
 27 JulDomesticO157:H72+1:1281as+
 31 JulDomesticO26:H111+1:16+2bs++
 1 AugDomesticO2:H2921:32+s+Non
 4 AugDomesticO26:H111+1:8+2as++
 5 AugDomesticO157:H72+1:1281aStr+
 6 AugDomesticO157:H72+1:1281ds+
 18 AugDomesticO26:H111+1:16+2as++
 21 AugDomesticO101:HNM2+1:128+s+
 28 AugDomesticO157:H72+1:1281as+
 4 SeptDomesticO157:H72+1:1281as+
 11 SeptCruise shipO157:H72+1:1281bs+
 11 SeptCruise shipO157:H72+1:1281bs+
 19 SeptCruise shipO157:H72+1:1281bs+
 19 SeptDomesticO157:H72+1:1281cSul,Tet,Str+
 23 SeptDomesticO157:H72+1:1281as+
 13 SeptDomesticO157:H72+1:1281as+
 18 SeptDomesticO157:H72+1:1281as+
 18 SeptDomesticO157:H72+1:1281as+
 18 SeptDomesticO157:H72+1:1281as+
 27 SeptDomesticO157:H72+1:1281as+
 14 SeptDomesticO157:H72+1:1281as+
 26 SeptDomesticO157:H72+1:1281cSul,Tet,Str+
 26 SeptDomesticO157:H72+1:1281cSul,Tet,Str+
 27 SeptDomesticO157:H72+1:1281bStr+
 27 SeptDomesticO157:H72+1:1281bStr+
 21 OctDomesticO157:H72+1:1281as+
 26 OctFranceO107:H272+s+Non
 4 NovDomesticO157:H72+1:1281as+
 20 NovDomesticO26:HNM1+1:8+Sul,Str+Non
 26 NovDomesticO91:H212+s+Non
 22 DecDomesticO157:H72+1:1281as+
 26 DecDomesticO157:H72+1:1281as+
 24 DecDomesticO157:H72+1:1281as+
 30 DecDomesticO157:H72+1:1281as+
 31 DecDomesticO157:H72+1:1281as+
  • a 1, carriage ofstx 1 gene; 2, carriage ofstx 2 gene; 1, 2, carriage of both genes.

  • b −, negative; +, positive.

  • c Stx production; toxin titers are given; −, no toxin is produced.

  • d Sor, sorbitol fermentation. −, negative for sorbitol fermentation; +, positive for sorbitol fermentation.

  • e PFGE types; 1a, 1b, etc., represent serotype O157:H7 isolates, and 2a, 2b, and 2c represent serotype O26:H11 isolates.

  • f s, sensitive. The following antibiotics were used in the susceptibility test: ampicillin (Amp), ceftriaxone, chloramphenicol, ciprofloxacin, imipenem, mecillinam, nalidixic acid, neomycin, streptomycin (Str), sulfonamide (Sul), tetracycline (Tet), and trimethoprim.

  • g Ehly, Ehly production; +, Ehly positive; Non, Ehly negative; −, hemolytic but Ehly negative.