Table 2.

Number of OSVS records where treatment efficacy or failure was reported by the number of antimicrobials used for treatment (July 1, 2007 – June 30, 2009)

Number of antimicrobials used	1	2	3	4	Total
Treatment failure	360	86	26	1	473
Efficacious treatment	175	26	2	0	203
Total	535	112	28	1