Figure 3.

Neighbour-joining phylogenetic tree based on concatenated gene sequences from 36 Listeria monocytogenes isolates. The concatenated allele sequences representing each strain were used to generate the phylogenetic tree using MEGA. Bootstrap values >50% are shown based on 500 replicates. Labels represent ST numbers with strain designations in parentheses. Lineage I and II are indicated by a vertical line. The scale bar denotes 0·02 nucleotide substitutions per site. All isolates are from Norway except 31* (from Sweden) and 24*(from Denmark).