Fig. 2From: Differences in Staphylococcus aureus nasal carriage and molecular characteristics among community residents and healthcare workers at Sun Yat-Sen University, Guangzhou, Southern ChinaPhylogenetic relationships of 41 Staphylococcus aureus strains isolated from healthcare workers (HW) and community residents (CR) based on multilocus sequence typing (MLST) data. The neighbor joining tree was based on the distance matrix of pair-wise differences between sequence types (STs), determined using the S. aureus MLST database (http://saureus.mlst.net/), implemented in MEGA v5.1 using Kimura-2-parameter distances. The relationships shown were based on 1000 re-samplings for bootstrapping. Each clonal complex (CC) is composed of STs that cluster with a ≥ 70 % bootstrap confidence value. PFGE, pulsed-field gel electrophoresis;Pvl, Panton-Valentine leucocidin gene; sea, Staphylococcus aureus enterotoxin A gene; seb, Staphylococcus aureus enterotoxin B gene; −, negative; +, positiveBack to article page