Occurrence of Multidrug Resistant Extended Spectrum Beta-Lactamase-Producing Bacteria on Iceberg Lettuce Retailed for Human Consumption

Figure 2

Phylogenetic tree of ESBL sequences. The phylogenetic tree represents a majority rule consensus tree based on protein similarity using neighbor joining. Bootstrap values (total 100) are calculated with neighbor joining and maximum likelihood methods. Klebsiella pneumoniae SHV is the outgroup.