FIG. 1.
Virulence gene patterns, sources of strains, phylogenetic groups, and results of serum tests for 347 E. coli strains. For VAGs the presence of a gene in a strain is indicated by a black bar. The sources of strains are indicated as follows: light gray, Afecal strains; dark gray, Aenviron strains; and light green, APEC strains. EcoR groups are indicated as follows: yellowish, group A; blue, group B1; red, group B2; and green, group D. The results of the serum test are indicated as follows: dark blue, resistant; light gray, intermediate resistance; cyan, sensitive. Genes not present in any of the strains (afa/dra, bfp, nfaE, stx1, and stx2) are not shown. epis., episomal; chr., chromosomal.