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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: J Neurosurg Spine. 2015 Apr 10;23(1):128–134. doi: 10.3171/2014.10.SPINE14559

FIG. 2.

FIG. 2

Surgical site infection rates per 100 surgeries by month for gram-positive cocci (A), S. aureus (B), MSSA (C), and gram-negative bacilli (D). Polynomial regression analysis resulted in a best-fit line that showed statistically significant seasonal variation with the highest SSI prevalence rate during the summer months for gram-positive cocci (A), S. aureus (B), and MSSA (C), and during the nonsummer months for gram-negative bacilli (D).