Figure. Maximum-likelihood phylogeny of Cronobacter isolates cultured from the blood of an infant (Ck0001) and the mother’s expressed breast milk (Ck0002) with C. sakazakii Sp291 as reference. Shaded circle highlights the clustering of sequence type 4 isolates. Scale bar indicates nucleotide substitutions per site. Methods for culturing isolates described in Technical Appendix. ST, sequence type.