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Volume 16, Number 5—May 2010

Research

Methicillin-Resistant Staphylococcus aureus Carriage and Risk Factors for Skin Infections, Southwestern Alaska, USA

A. Michal Stevens, Thomas W. HennessyComments to Author , Henry C. Baggett, Dana Bruden, Debbie Parks, and Joseph Klejka
Author affiliations: Centers for Disease Control and Prevention, Anchorage, Alaska, USA (A.M. Stevens, T. Hennessy, D. Bruden, D. Parks); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (H.C. Baggett); Yukon Kuskokwim Heath Corporation, Bethel, Alaska, USA (J. Klejka)

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Table 2

Staphylococcus aureus skin infections among study participants, by year, Alaska, 2000–2004*

Skin infection outcome MRSA carriers, n = 41 MSSA carriers, n = 85 Non–S. aureus carriers, n = 190 p value
MRSA vs. 
non–S. aureus MSSA vs. 
non–S. aureus
Skin infection rate, %
Year 1 56 32 30 0.001 0.77
Year 2 37 26 30 0.42 0.50
Year 3
32
21
21
0.15
0.98
Cumulative % with >1 skin infection†
Year 1 56 32 30 0.001 0.69
Year 2 61 41 48 0.02 0.48
Year 3
66
52
58
0.07
0.50
1st year of follow-up
Mean no. skin infections‡ 0.7 0.4 0.4 0.001 0.73
No. (%) with >2 infections§
6 (15)
7 (8)
13 (7)
0.10
0.68
Entire follow-up period, 3.6 y
Mean no. skin infections‡ 1.9 1.2 1.1 0.03 0.60
No. (%) with >3 infections§ 13 (32) 13 (15) 24 (13) 0.02 0.72

*MRSA, methicillin-resistant Staphylococcus aureus; MSSA, methicillin-susceptible S. aureus. Skin infection rate per 100 persons in each of the 3 years; 2-sample Poisson test was used to compare skin infection rates.
†Comparisons made by use of Log-Rank statistic in Kaplan-Meier estimation of survival curve.
‡Comparisons made by use of Kruskal-Wallis statistic.
§Chi-square test used for calculation of p value.

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