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The yearly trend of MSSA and MRSA infection in the last decade, showing a significant rise in overall incidence of Staphylococcus aureus infections in 2004. The extended Mantel-Haenszel chi-square test for linear trend also showed a significant increase in MRSA infections over the 10-year period (p = 0.0007), but no trend in increase of MSSA infections (p = 0.229).
