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Figure. Unrooted tree showing the phylogenetic relationships among
Staphylococcus aureus isolates from pig farmers (PF), bank or insurance
workers (BIW), and swine (S). The tree was obtained by the neighbor-joining
method, based on the comparison of partial sequences of 7 housekeeping
genes (arcC, aroE, glpF, gmk, pta,
tpi, and yqiL). Values (in percentages) above the lines
indicate how the tree's branches are supported by the results of bootstrap
analysis. Scale bar = accumulated changes per nucleotide. Isolates from
PF, BIW, and S are indicated by red, green, and blue triangles, respectively.
Letters between square brackets indicate departments where strains were
isolated (CA, Côte d'Armor; F, Finistère; IV, Ile et vilaine; M, Morbihan;
ML, Maine et Loire;V, Vendée;Y, Yonne). Letters in parenthesis indicate
the antimicrobial agents to which strains were resistant (E, erythromycin;
G, gentamicin; K, kanamycin; L, lincomycin; M, methicillin; P, penicillin;
Pef, pefloxacin; Pri, pristinamycin; and T, tobramycin). ST, sequence
type. ST numbers shown on the right of the tree are from the S. aureus
multilocus sequence typing database.
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