FIG 2.

Core SNP-based phylogenetic tree of STC131 strains. Colors of the strain names reflect the isolation sources, i.e., blue for the WWTP, red for hospital wastewater, and black for those analyzed in our previous study and SE15. Most strains in black were clinical isolates. IEH71520 was obtained from vacuum cleaner dust collected from the home of a case patient (50). SE15 was obtained from the feces of a healthy adult (51). S100EC was obtained from a rectal swab in a prospective study of returned travelers (12, 52). The QRDR column indicates amino acids of GyrA codons 83 and 87 and ParC codons 80 and 84. The ST131 clades/subclades are shown in different colors. JSWP007 carried a fimH allele that is different from fimH30 by one nucleotide. NT, nontypeable.