Natural population dynamics and expansion of pathogenic clones of Staphylococcus aureus
J. Clin. Invest. Damian C. Melles, et al. 114:1732 doi:10.1172/JCI23083 [Go to this article.]

Figure 5
Distribution of S. aureus strains in the 5 phylogenetic branches. *Overrepresentation of carriage in elderly adults (Fisher’s exact test, P = 0.01); **overrepresentation of carriage in children (Fisher’s exact test, P < 0.0001); ***proportionately more bacteremia-associated strains from elderly adults as compared to carriage strains from the same group (3% vs. 10%; Fisher’s exact test, P = 0.0095); proportionately fewer impetigo-associated strains as compared to carriage in children (8% vs. 26%; Fisher’s exact test, P = 0.01); overrepresentation of impetigo-associated strains as compared to carriage in children (38% vs. 5%; Fisher’s exact test, P < 0.0001); –proportionately more MRSA strains as compared to all carriage isolates (76% vs. 44%; Fisher’s exact test, P < 0.006).