TABLE 5.

Distribution of different stx genes in STEC strains according to the clinical pictures of the 160 patients for whom clinical data were available

stx gene(s) (n)No. of patients with symptom or diagnosis (%):
HUS or TTPf (n = 20)aBloody diarrhea (n = 77)bNonbloody diarrhea (n = 37)Asymptomatic (n = 26)cNot known (n = 10)
stx2 only (34)5a (25)11b (14)8 (22)8 (31)2 (20)
stx2 and stx2c (72)10 (50)41 (53)11 (30)9 (35)1 (10)
stx2c (9)3 (15)2 (3)1 (3)2 (8)1 (10)
Undigestible (2)1f (5)0 (0)0 (0)1c (4)0 (0)
PCR negativee (2)1f (5)1b (1)0 (0)0 (0)0 (0)
stx2 and stx2vhb (3)0 (0)1 (1)2 (5)0 (0)0 (0)
stx2 or stx2 variant and stx1 (10)0 (0)5 (6)3 (8)1 (4)1 (10)
stx2vhb (5)0 (0)3 (4)2 (5)0 (0)0 (0)
stx2d-Ount (2)0 (0)1 (1)1 (3)0 (0)0 (0)
stx1 (28)0 (0)12 (16)7 (19)4 (15)5 (50)
Weak positived (3)0 (0)0 (0)2 (5)1 (4)0 (0)
  • a One patient had a simultaneous infection with O157:H:PT88:stx2 and O145:H28:stx2 strains (the number of isolates is 21 when including the O145:H28:stx2 strain).

  • b One patient had a simultaneous infection with O157:H:PT88 lacking stx and O145:H28:stx2 strains (the number of isolates is 78 when including the O145:H28/H:stx2 strain).

  • c One patient had a consecutive infection with O102:H7:undigestible and O Rough:H18:undigestible (the number of isolates is 27 when including the O Rough:H18:undigestible strain).

  • d Repeatedly obtained result in PCR for stx according to Bastian et al. (1) and Lin et al. (27).

  • e Negative results in PCR for stx according to Bastian et al. (1) and Lin et al. (27).

  • f Two patients had TTP.